docs(superpowers): v0.20.x logging r2 spec + plan artifacts

logging round 2 (4 enhancement: image_w/h + V008 SQLite mirror + CLI inspect + retention) 의 spec/plan ACCEPT 후 round artifacts. - spec: 751 line (ACCEPT, 7/7 critic round 1 finding + 7/7 closure r2 traceability) - plan: 576 line (ACCEPT, 6/6 step + 13/13 AC + G1/G2/G3 plan-level resolve) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-28 08:04:32 +00:00
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+---
+title: v0.20.x ingest log round 2 — implementation plan
+created: 2026-05-28
+status: DRAFT round 0
+phase: B5 plan drafter
+target_spec: docs/superpowers/specs/2026-05-28-v0.20.x-logging-r2-spec.md
+critic_r1: .omc/reviews/2026-05-28-v0.20.x-logging-r2-spec-closure-result.md
+critic_r2: .omc/reviews/2026-05-28-v0.20.x-logging-r2-spec-closure-r2-result.md
+branch: feat/ingest-log-round2-enhancements
+step_count: 6
+commit_count: 5
+---
+
+# v0.20.x ingest log round 2 — implementation plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL — `superpowers:executing-plans` (or `superpowers:subagent-driven-development`) to implement task-by-task. Steps use `- [ ]` checkbox syntax. Each Step block carries its own commit boundary; Step 6 is verify-only (no commit).
+
+**Goal.** Extend v0.20.0 round 1 ingest log (file-only ndjson) with four additive enhancements: (1) raster image dimensions, (2) SQLite mirror via V008 + dual-write, (3) CLI `inspect ocr-stats` / `inspect ocr-failures` + two wire schemas, (4) automatic file + SQLite retention. All non-breaking; wire schema cascades as additive minor; existing 1370 workspace test → 1375+.
+
+**Architecture.** Hook the dual-write at the existing OCR `emit_progress` closure inside `ingest_with_config_opts`. File write first (durable), SQLite second (non-critical — `tracing::warn!` on failure). The closure pre-captures `doc_id` and clones `Arc<SqliteStore>` from `App.sqlite` before `apply_ocr_to_pdf_pages` runs (F1 + G1 resolution). Two `App::inspect_*` methods follow the facade rule via `*_with_config` companions (G2). Runtime introspection emit `WIRE_SCHEMAS` gets two entries; the JSON Schema file `schema.schema.json` is untouched (G3: it's pattern-based).
+
+**Tech stack.** Rust 2024, rusqlite (existing), `image` crate (`jpeg` feature add), `time` (existing). No new workspace deps.
+
+**Spec contract.** `docs/superpowers/specs/2026-05-28-v0.20.x-logging-r2-spec.md` (751 line). Implements 13 AC + resolves 3 closure-r2 findings (G1/G2/G3) + 6 closure-r1 findings (F1–F6).
+
+---
+
+## File map
+
+**Modify (10):**
+- `crates/kebab-app/Cargo.toml` — `image` features += `"jpeg"` (F3).
+- `crates/kebab-app/src/pdf_ocr_apply.rs` — `extract_image_dimensions` helper + fill 6 emit points (Enhancement 1).
+- `crates/kebab-app/src/ingest_log.rs` — `LogEvent::Ocr` adds `doc_id`; `IngestLogWriter::open` runs `cleanup_old_logs`; `percentiles` returns `(p50, p90, p99, max)`.
+- `crates/kebab-app/src/lib.rs::ingest_with_config_opts` — pre-capture `doc_id_for_log`, clone `Arc<SqliteStore>`, dual-write inside closure (F1 + G1).
+- `crates/kebab-app/src/schema.rs` — `WIRE_SCHEMAS` += `"ocr_stats.v1"`, `"ocr_failures.v1"` (G3 runtime emit).
+- `crates/kebab-app/src/app.rs` — `inspect_ocr_stats` / `inspect_ocr_failures` + `*_with_config` companion pair (G2) + 4 wire structs.
+- `crates/kebab-config/src/lib.rs` — `LoggingCfg` += `keep_recent_runs: u32`, `retention_days: u32` (`#[serde(default=...)]`, defaults 100 + 30, AC-9).
+- `crates/kebab-store-sqlite/src/store.rs` — `record_pdf_ocr_event` + `prune_pdf_ocr_events` (Mutex lock pattern, F2).
+- `crates/kebab-cli/src/main.rs` — `InspectWhat::OcrStats` + `InspectWhat::OcrFailures` variants + dispatch arms calling `*_with_config` (G2).
+- `integrations/claude-code/kebab/SKILL.md` — list `ocr_stats.v1` + `ocr_failures.v1` (AC-13).
+
+**Create (5):**
+- `migrations/V008__pdf_ocr_events.sql` — table + 3 indices.
+- `docs/wire-schema/v1/ocr_stats.schema.json` — `ocr_stats.v1` JSON Schema (verbatim from spec §4.3).
+- `docs/wire-schema/v1/ocr_failures.schema.json` — `ocr_failures.v1` JSON Schema (verbatim from spec §4.3).
+- `crates/kebab-app/tests/ocr_inspect_smoke.rs` — AC-4/5/6/13.
+- `crates/kebab-store-sqlite/tests/pdf_ocr_events_insert_smoke.rs` — AC-2/3/8.
+
+**Do NOT modify:**
+- `docs/wire-schema/v1/schema.schema.json` — `wire.schemas` is `pattern`-based (G3).
+- Spec ACCEPT frozen. Round 1 spec / PDF OCR spec / parent design doc untouched.
+
+---
+
+## Closure r2 plan-level resolution
+
+### G1 (MEDIUM) — `SqliteStore::open` signature + double-open risk
+
+Spec §4.7 snippet `SqliteStore::open(&cfg.storage.sqlite)?` fails to compile — real signature at `crates/kebab-store-sqlite/src/store.rs:123` is `pub fn open(config: &kebab_config::Config) -> Result<Self>`. Worse, a fresh `open()` would create a second connection contending with `App::sqlite` for the single-writer lock and re-running migrations.
+
+**Resolution (Step 3.3).** Inside `ingest_with_config_opts`, beside the existing `lw_for_ocr` pre-clone at `crates/kebab-app/src/lib.rs:1931`, add:
+
+```rust
+let store_for_ocr: Arc<SqliteStore> = Arc::clone(&app.sqlite);
+```
+
+`App.sqlite` is `pub(crate) sqlite: Arc<SqliteStore>` at `crates/kebab-app/src/app.rs:123` — visible inside the crate. The closure moves `store_for_ocr`. **No new `SqliteStore::open` call anywhere.**
+
+### G2 (LOW–MEDIUM) — facade rule for `inspect_ocr_*`
+
+Spec §4.4 declares only `App::inspect_ocr_stats(&self)`. CLAUDE.md "the facade rule" requires a `*_with_config(cfg, …)` companion. HOTFIXES P3-5 and P4-3 record two regressions of this exact shape.
+
+**Resolution (Step 4.5).** Both methods ship as a pair:
+
+```rust
+pub fn inspect_ocr_stats(&self) -> Result<OcrStatsV1> {
+    self.inspect_ocr_stats_with_config(&self.config)
+}
+#[doc(hidden)]
+pub fn inspect_ocr_stats_with_config(&self, _cfg: &Config) -> Result<OcrStatsV1> { … }
+```
+
+Same shape for `inspect_ocr_failures`. The CLI dispatch (Step 4.6) calls the explicit `_with_config` form so `--config <path>` is honored — current ingest path already threads `cfg` via `App::open_with_config(cfg.clone())`.
+
+### G3 (LOW) — wire schema runtime emit, not JSON Schema file
+
+Spec §4.3 line 299-301 says "schema.schema.json 갱신" but `docs/wire-schema/v1/schema.schema.json` declares `"schemas": { "type": "array", "items": { "type": "string", "pattern": "^[a-z_]+\\.v[0-9]+$" } }` — pattern-based, not enum. The two new strings already match.
+
+**Resolution (Step 4.2).** Extend `WIRE_SCHEMAS` const at `crates/kebab-app/src/schema.rs:104-119` (runtime emit source for `kebab schema --json`). Two new schema *files* (`ocr_stats.schema.json` + `ocr_failures.schema.json`) are still created as the external contract; the meta `schema.schema.json` is untouched.
+
+---
+
+## Closure r1 finding resolution recap
+
+| Finding | Severity | Plan step | Resolution |
+|--|--|--|--|
+| F1 doc_id NULL in dual-write | HIGH | Step 3 | pre-capture `canonical.doc_id.0.clone()` |
+| F2 SqliteStore conn lock pattern | MEDIUM | Step 2 | `self.conn.lock().expect("sqlite lock poisoned")` |
+| F3 image crate jpeg feature | MEDIUM | Step 1 | `features = ["png", "jpeg"]` |
+| F4 percentile + p99 | LOW | Step 4 | extend `ingest_log::percentiles` to 4-tuple |
+| F5 OR-on-stale wording | LOW | Step 5 | inline comment in `cleanup_old_logs` |
+| F6 V008 rollback | LOW | (spec §6 R-2) | already in spec, no plan action |
+
+---
+
+## Step 1 — image_width / image_height capture (Enhancement 1)
+
+**Implements:** AC-1. **Commit 1/5.**
+
+**Files:** Modify `crates/kebab-app/Cargo.toml`, `crates/kebab-app/src/pdf_ocr_apply.rs`.
+
+- [ ] **1.1 Cargo feature.** `image = { version = "0.25", default-features = false, features = ["png", "jpeg"] }` (was `["png"]` only). Rationale F3.
+
+- [ ] **1.2 Failing unit tests** in `pdf_ocr_apply::tests`:
+  - `extract_image_dimensions_valid_jpeg` — load 16x12 fixture JPEG, assert `Some((16, 12))`.
+  - `extract_image_dimensions_corrupt_returns_none` — `b"not a jpeg"` → `None`.
+
+  If `fixtures/pdf_ocr/sample_16x12.jpg` doesn't exist, generate via `convert -size 16x12 xc:white …` and commit. If a comparable small JPEG already lives under `fixtures/`, reuse it.
+
+- [ ] **1.3 Helper impl.** Add near the top of `pdf_ocr_apply.rs`:
+
+  ```rust
+  fn extract_image_dimensions(jpeg_bytes: &[u8]) -> Option<(u32, u32)> {
+      use image::ImageReader;
+      ImageReader::new(std::io::Cursor::new(jpeg_bytes))
+          .with_guessed_format().ok()?
+          .into_dimensions().ok()
+  }
+  ```
+
+  Returns `Option` so corrupt JPEG falls back to `(None, None)` (R-4 mitigation).
+
+- [ ] **1.4 Fill 6 emit points** at lines 149, 155, 181, 188, 259, 265 (probe-confirmed). Each currently hardcodes `image_width: None, image_height: None`. Pattern:
+
+  ```rust
+  let (image_width, image_height) = extract_image_dimensions(&page_image_bytes)
+      .map(|(w, h)| (Some(w), Some(h)))
+      .unwrap_or((None, None));
+  ```
+
+  Then pass `image_width` / `image_height` (and `image_byte_size: Some(page_image_bytes.len() as u64)`) into the `PdfOcrProgress::Finished` constructor. For skip / error paths where `page_image_bytes` isn't in scope, leave `None` — AC-1 only requires non-null on successful raster decode.
+
+- [ ] **1.5 Verify.** `cargo test -p kebab-app --lib pdf_ocr_apply::tests` + `cargo test -p kebab-app --test pdf_ocr_roundtrip`.
+
+- [ ] **1.6 Commit.** Use HEREDOC form so the body formats correctly:
+
+  ```
+  feat(app): capture image_width/height in PDF OCR raster decode (Enhancement 1)
+
+  Add extract_image_dimensions(jpeg_bytes) helper using image::ImageReader
+  and fill the 6 PdfOcrProgress::Finished emit points in pdf_ocr_apply.rs.
+  Result: LogEvent::Ocr now carries non-null image_width/image_height on
+  successful raster decode, enabling future size-conditioned timeout tuning.
+
+  Closure r1 F3: kebab-app/Cargo.toml image features += "jpeg" (explicit
+  rather than relying on feature unification via kebab-parse-image).
+
+  Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
+  ```
+
+---
+
+## Step 2 — V008 migration + SqliteStore record/prune (Enhancement 2 — schema half)
+
+**Implements:** AC-2, AC-8 prune logic. **Commit 2/5.**
+
+**Files:** Create `migrations/V008__pdf_ocr_events.sql`, `crates/kebab-store-sqlite/tests/pdf_ocr_events_insert_smoke.rs`. Modify `crates/kebab-store-sqlite/src/store.rs`.
+
+- [ ] **2.1 V008 SQL** per spec §4.2:
+
+  ```sql
+  CREATE TABLE pdf_ocr_events (
+    id INTEGER PRIMARY KEY,
+    run_id TEXT NOT NULL, ts TEXT NOT NULL,
+    doc_id TEXT, doc_path TEXT NOT NULL, page INTEGER NOT NULL,
+    image_byte_size INTEGER, image_width INTEGER, image_height INTEGER,
+    ms INTEGER NOT NULL, chars INTEGER NOT NULL,
+    success INTEGER NOT NULL, reason TEXT, ocr_engine TEXT NOT NULL
+  );
+  CREATE INDEX idx_pdf_ocr_events_doc_id ON pdf_ocr_events(doc_id);
+  CREATE INDEX idx_pdf_ocr_events_run_id ON pdf_ocr_events(run_id);
+  CREATE INDEX idx_pdf_ocr_events_ts ON pdf_ocr_events(ts);
+  ```
+
+- [ ] **2.2 Failing smoke tests** in new `pdf_ocr_events_insert_smoke.rs`:
+  - `v008_pdf_ocr_events_table_exists` — open TempDir SqliteStore, run_migrations, `SELECT name FROM sqlite_master WHERE name='pdf_ocr_events'`.
+  - `record_and_prune_pdf_ocr_event` — insert 2 rows (`ts = 1970-…` and `ts = 2026-…`), `prune_pdf_ocr_events(0)` returns `1`, only the future-stamped row survives.
+
+  Use existing per-test `Config` builder (probe `crates/kebab-store-sqlite/tests/*.rs` for prior smoke pattern; if absent, build `Config::default()` with `data_dir = tempdir.path()`).
+
+- [ ] **2.3 Implement two pub fn** on `impl SqliteStore` in `store.rs`, signatures per spec §4.2 line 186-228:
+
+  ```rust
+  #[allow(clippy::too_many_arguments)]
+  pub fn record_pdf_ocr_event(&self,
+      run_id: &str, ts: &str, doc_id: Option<&str>, doc_path: &str, page: u32,
+      image_byte_size: Option<u64>, image_width: Option<u32>, image_height: Option<u32>,
+      ms: u64, chars: u32, success: bool, reason: Option<&str>, ocr_engine: &str,
+  ) -> anyhow::Result<()>;
+
+  pub fn prune_pdf_ocr_events(&self, retention_days: u32) -> anyhow::Result<u64>;
+  ```
+
+  Body: F2 lock pattern `let conn = self.conn.lock().expect("sqlite lock poisoned");` followed by `INSERT INTO pdf_ocr_events (…) VALUES (…)` / `DELETE FROM pdf_ocr_events WHERE ts < ?` (cutoff from `time::OffsetDateTime::now_utc() - Duration::days(retention_days as i64)`, RFC 3339 format). `prune` returns the deleted row count (`u64`).
+
+- [ ] **2.4 Verify.** `cargo test -p kebab-store-sqlite --test pdf_ocr_events_insert_smoke`.
+
+- [ ] **2.5 Commit.**
+
+  ```
+  feat(store): V008 pdf_ocr_events migration + record/prune API (Enhancement 2)
+
+  Add migrations/V008__pdf_ocr_events.sql with the events table + 3
+  indices (doc_id, run_id, ts). SqliteStore gains two pub fn:
+  record_pdf_ocr_event (insert one OCR sample) and prune_pdf_ocr_events
+  (delete rows older than retention_days; returns the affected row
+  count). Both follow the existing Mutex<Connection> lock pattern.
+
+  Wiring into ingest path lands in the next commit.
+
+  Closure r1 F2: explicit lock acquisition in both methods.
+
+  Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
+  ```
+
+---
+
+## Step 3 — Dual-write integration (Enhancement 2 — wiring half)
+
+**Implements:** AC-3. Resolves F1 + G1. **Commit 3/5.**
+
+**Files:** Modify `crates/kebab-app/src/ingest_log.rs`, `crates/kebab-app/src/lib.rs`.
+
+- [ ] **3.1 Extend `LogEvent::Ocr`** at `ingest_log.rs:116` — add `doc_id: Option<&'a str>` as the second field (after `ts`, before `doc_path`). Additive Serde — round 1 ndjson logs deserialize with `doc_id = None` (Serde's default `Option` handling, no `#[serde(default)]` needed because round 1 readers don't exist outside the test suite).
+
+- [ ] **3.2 Failing integration test** appended to `pdf_ocr_events_insert_smoke.rs`:
+  - `ingest_dual_write_doc_id_matches_ndjson` — run scanned-PDF ingest via `App::open_with_config`, then for every emitted OCR event assert `pdf_ocr_events.doc_id` equals the ndjson `LogEvent::Ocr.doc_id`, and both equal `canonical.doc_id`. Reuse the `pdf_ocr_roundtrip` test scaffold for the scanned fixture.
+
+- [ ] **3.3 Pre-capture in `ingest_with_config_opts`.** Immediately after the existing `let doc_path_for_log = asset.workspace_path.0.clone();` at `lib.rs:1935`, add:
+
+  ```rust
+  let doc_id_for_log: String = canonical.doc_id.0.clone();
+  let store_for_ocr: Arc<SqliteStore> = Arc::clone(&app.sqlite);  // G1
+  let run_id_for_log: String = lw_for_ocr.as_ref()
+      .and_then(|lw| lw.lock().ok().map(|w| w.run_id().to_string()))
+      .unwrap_or_default();
+  ```
+
+  `canonical` is bound at `lib.rs:1912` via `app.extract_for(...)` — in scope before the closure. All three captures are owned values / Arc → `Send + 'static` (rusqlite `Connection` is not `Send`, but `Mutex<Connection>` inside `Arc<SqliteStore>` is `Send + Sync`).
+
+- [ ] **3.4 Wire into closure.** Inside the existing `PdfOcrProgress::Finished` arm at `lib.rs:1950-2000`, replace the current file-write block with: (a) bind `ts_for_event = ingest_log::now_ts()`, (b) pass `doc_id: Some(&doc_id_for_log)` into the existing `LogEvent::Ocr` construction, (c) immediately after the file write, call `store_for_ocr.record_pdf_ocr_event(&run_id_for_log, &ts_for_event, Some(&doc_id_for_log), &doc_path_for_log, page, image_byte_size, image_width, image_height, ms, chars, success, reason_str, engine.engine_name())` wrapped in `if let Err(e) = … { tracing::warn!(target: "kebab-app", "sqlite ocr event insert failed: {e}"); }`. File write first → SQLite second (R-1 ordering).
+
+- [ ] **3.5 Update existing tests** that consume `LogEvent::Ocr`:
+  - `ingest_log_smoke` (and any sibling smoke that round-trips ndjson) — assertions must accept the new `doc_id` field. Either ignore or assert `Some(_)`.
+  - `logging_roundtrip` integration test — same.
+
+- [ ] **3.6 Verify.** `cargo test -p kebab-app --test pdf_ocr_roundtrip ingest_log_smoke logging_roundtrip` + `cargo test -p kebab-store-sqlite --test pdf_ocr_events_insert_smoke ingest_dual_write_doc_id_matches_ndjson`.
+
+- [ ] **3.7 Commit.**
+
+  ```
+  feat(app): dual-write PDF OCR events to SQLite + ndjson (Enhancement 2 wiring)
+
+  Pre-capture canonical.doc_id and Arc<SqliteStore> before the OCR
+  emit_progress closure so both the ndjson file and the SQLite mirror
+  carry the same doc_id for every event. File write is durable
+  (errors propagate); SQLite insert is non-critical (tracing::warn on
+  failure, ingest does not abort) per spec R-1.
+
+  LogEvent::Ocr gains a doc_id: Option<&str> field as an additive
+  Serde change — round 1 ndjson logs deserialize with doc_id=None.
+
+  Closure r1 F1: doc_id NULL in dual-write resolved via
+  let doc_id_for_log = canonical.doc_id.0.clone() pre-capture.
+  Closure r2 G1: Arc::clone(&app.sqlite) reused instead of opening a
+  second SqliteStore — eliminates double-open lock contention and
+  duplicate migration runs.
+
+  Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
+  ```
+
+---
+
+## Step 4 — CLI inspect commands + wire schemas (Enhancement 3)
+
+**Implements:** AC-4, AC-5, AC-6, AC-11 (`ocr_inspect_smoke`), AC-13. Resolves G2 + G3 + F4. **Commit 4/5.**
+
+**Files:** Modify `crates/kebab-app/src/ingest_log.rs`, `crates/kebab-app/src/schema.rs`, `crates/kebab-app/src/app.rs`, `crates/kebab-cli/src/main.rs`, `integrations/claude-code/kebab/SKILL.md`. Create `docs/wire-schema/v1/ocr_stats.schema.json`, `docs/wire-schema/v1/ocr_failures.schema.json`, `crates/kebab-app/tests/ocr_inspect_smoke.rs`.
+
+- [ ] **4.1 JSON Schema files.** Author the two files verbatim from spec §4.3 line 234-297. These are the external contract for downstream consumers (claude-code skill, MCP).
+
+- [ ] **4.2 `WIRE_SCHEMAS` runtime emit (G3).** In `crates/kebab-app/src/schema.rs:104`, append two entries to the `&[&str]` literal: `"ocr_stats.v1"`, `"ocr_failures.v1"`. **Do NOT edit `docs/wire-schema/v1/schema.schema.json`** — its `wire.schemas` is `pattern`-based.
+
+- [ ] **4.3 Percentile helper (F4).** Change `crates/kebab-app/src/ingest_log.rs:200` `pub(crate) fn percentiles` from returning `(Option<u64>, Option<u64>, Option<u64>)` (p50, p90, max) to `(Option<u64>, Option<u64>, Option<u64>, Option<u64>)` (p50, p90, p99, max). Implementation: sort in-memory, pick at index `((n-1) * q).round()` for `q ∈ {0.50, 0.90, 0.99}`, `*sorted.last()` for max. Update all callers inside `kebab-app` (1-2 sites) to destructure 4 elements. `IngestSummary` (round 1, 3-percentile) stays as-is — p99 surfaces only via `inspect ocr-stats`.
+
+- [ ] **4.4 Wire types** in `crates/kebab-app/src/app.rs` (or new sibling `inspect_ocr.rs` under the same module umbrella):
+  - `OcrStatsV1`: `schema_version: &'static str`, `total_events`, `total_runs`, `success_count`, `failure_count: u64`; `success_rate: f64`; `p50_ms`, `p90_ms`, `p99_ms`, `max_ms: Option<u64>`; `by_engine: BTreeMap<String, u64>`; `by_doc: Vec<OcrStatsByDoc>`.
+  - `OcrStatsByDoc`: `doc_id: String`, `failure_count`, `success_count: u64`, `p90_ms: Option<u64>`.
+  - `OcrFailuresV1`: `schema_version: &'static str`, `doc_id: Option<String>`, `failure_count: u64`, `failures: Vec<OcrFailureRow>`.
+  - `OcrFailureRow`: `ts: String`, `page: u32`, `ms: u64`, `reason: String`, `image_byte_size: Option<u64>`.
+
+  All `#[derive(serde::Serialize)]`. `schema_version` uses string literal `"ocr_stats.v1"` / `"ocr_failures.v1"` at construction.
+
+- [ ] **4.5 Facade pair (G2)** on `impl App`:
+
+  ```rust
+  pub fn inspect_ocr_stats(&self) -> Result<OcrStatsV1> { self.inspect_ocr_stats_with_config(&self.config) }
+  #[doc(hidden)]
+  pub fn inspect_ocr_stats_with_config(&self, _cfg: &Config) -> Result<OcrStatsV1>;
+
+  pub fn inspect_ocr_failures(&self, doc_id: Option<&str>, limit: usize) -> Result<OcrFailuresV1> {
+      self.inspect_ocr_failures_with_config(&self.config, doc_id, limit)
+  }
+  #[doc(hidden)]
+  pub fn inspect_ocr_failures_with_config(&self, _cfg: &Config, doc_id: Option<&str>, limit: usize) -> Result<OcrFailuresV1>;
+  ```
+
+  Implementation reads from `self.sqlite` (the App's `Arc<SqliteStore>`):
+
+  - `inspect_ocr_stats_with_config`:
+    1. `SELECT COUNT(*), SUM(CASE WHEN success=1 …), SUM(CASE WHEN success=0 …), COUNT(DISTINCT run_id) FROM pdf_ocr_events` → 4 counters.
+    2. `SELECT ms FROM pdf_ocr_events WHERE success=1 ORDER BY ms` → `Vec<u64>` → `ingest_log::percentiles(&samples)` → 4-tuple.
+    3. `SELECT ocr_engine, COUNT(*) FROM pdf_ocr_events GROUP BY ocr_engine` → `BTreeMap`.
+    4. `SELECT doc_id, SUM(success=0), SUM(success=1) FROM pdf_ocr_events WHERE doc_id IS NOT NULL GROUP BY doc_id ORDER BY 2 DESC LIMIT 10` → `Vec<OcrStatsByDoc>` with `p90_ms = None` (per-doc p90 deferred — see open question #3).
+    5. `success_rate = success_count / total_events` (guard zero-division).
+
+  - `inspect_ocr_failures_with_config`: `SELECT ts, page, ms, reason, image_byte_size FROM pdf_ocr_events WHERE success=0 [AND doc_id=?] ORDER BY ts DESC LIMIT ?`. Map to `OcrFailureRow`. `failure_count = failures.len()`.
+
+  Connection access: use existing `pub(crate)` `Mutex<Connection>` (either via an existing closure accessor on `SqliteStore` or by adding a `pub(crate) fn conn(&self) -> &Mutex<Connection>` — probe `store.rs` for prior pattern and follow it).
+
+- [ ] **4.6 CLI variants** in `crates/kebab-cli/src/main.rs:356` (extend `InspectWhat`):
+
+  ```rust
+  OcrStats,
+  OcrFailures {
+      #[arg(long)] doc_id: Option<String>,
+      #[arg(long, default_value_t = 10)] limit: usize,
+  },
+  ```
+
+  Dispatch arms at `main.rs:671` after the existing `Doc / Chunk` arms — for both, construct `App::open_with_config(cfg.clone())?`, call the `*_with_config(&cfg, …)` form (G2 explicit cfg threading), then route through the existing `print_json_or_text` helper (or whatever the file's pattern is — probe before naming).
+
+- [ ] **4.7 Integration test** in new `crates/kebab-app/tests/ocr_inspect_smoke.rs`:
+  - `ocr_stats_after_scanned_pdf_ingest` — TempDir KB, ingest the existing scanned-PDF fixture, assert `stats.schema_version == "ocr_stats.v1"`, `stats.total_events >= 1`, `0.0 ≤ stats.success_rate ≤ 1.0`.
+  - `ocr_failures_filter_by_doc_id` — requires a fixture that produces at least one failure (probe `fixtures/pdf/` for a corrupt-page or timeout-inducing PDF; if none exists, mark the test `#[ignore]` with a `// TODO(v0.20.y): fixture` and rely on `record_and_prune_pdf_ocr_event` for the synthetic-row coverage).
+  - `skill_md_lists_new_schemas` — `read_to_string("integrations/claude-code/kebab/SKILL.md").contains("ocr_stats.v1")` (AC-13 mechanical).
+
+- [ ] **4.8 SKILL.md sync** — append `ocr_stats.v1` and `ocr_failures.v1` to the wire schema enumeration block (currently at SKILL.md lines 37-147 per probe), each with a one-line description.
+
+- [ ] **4.9 Verify.** `cargo test -p kebab-app --test ocr_inspect_smoke` + `cargo build -p kebab-cli` (compile-only confirms variant + dispatch wire-up).
+
+- [ ] **4.10 Commit.**
+
+  ```
+  feat(cli): kebab inspect ocr-stats + ocr-failures (Enhancement 3 + wire schema additive minor)
+
+  Two new wire schemas land as additive minor: ocr_stats.v1 (corpus-wide
+  aggregate — total_events, success_rate, p50/p90/p99/max_ms, by_engine,
+  top-10 by_doc by failure count) and ocr_failures.v1 (per-doc or
+  corpus-wide recent failures, with --doc-id + --limit). Both ship via
+  new CLI subcommands `kebab inspect ocr-stats` / `inspect ocr-failures`.
+
+  App gains four facade methods: inspect_ocr_stats /
+  inspect_ocr_failures plus their *_with_config companions — required by
+  CLAUDE.md "the facade rule" so `--config <path>` is honored. The CLI
+  dispatch arms thread cfg explicitly into the _with_config form.
+
+  Runtime introspection emit (WIRE_SCHEMAS in schema.rs) gains two
+  entries; the meta JSON Schema (schema.schema.json) is untouched
+  because its wire.schemas is pattern-based, not enum-based.
+
+  ingest_log::percentiles extended to (p50, p90, p99, max). p99 surfaces
+  only via inspect ocr-stats; IngestSummary (round 1) stays 3-percentile.
+
+  SKILL.md synced with the two new schemas (AC-13).
+
+  Closure r2 G2 (facade *_with_config pair) + G3 (runtime emit, not
+  meta schema file) + closure r1 F4 (p99) resolved.
+
+  Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
+  ```
+
+---
+
+## Step 5 — Log retention (Enhancement 4)
+
+**Implements:** AC-7, AC-8 wire-up, AC-9, AC-12. Resolves F5. **Commit 5/5.**
+
+**Files:** Modify `crates/kebab-config/src/lib.rs`, `crates/kebab-app/src/ingest_log.rs`, `crates/kebab-app/src/lib.rs`, `docs/SMOKE.md`.
+
+- [ ] **5.1 Failing backward-compat test** in `crates/kebab-config` tests:
+  - `old_logging_config_parses_with_defaults` — toml input with only `ingest_log_enabled` + `ingest_log_dir`, assert `cfg.logging.keep_recent_runs == 100`, `retention_days == 30`.
+
+- [ ] **5.2 `LoggingCfg` extension** at `crates/kebab-config/src/lib.rs:438-462`:
+
+  ```rust
+  pub struct LoggingCfg {
+      pub ingest_log_enabled: bool,
+      pub ingest_log_dir: PathBuf,
+      #[serde(default = "default_keep_recent_runs")] pub keep_recent_runs: u32,
+      #[serde(default = "default_retention_days")] pub retention_days: u32,
+  }
+  fn default_keep_recent_runs() -> u32 { 100 }
+  fn default_retention_days() -> u32 { 30 }
+  ```
+
+  Plus `impl Default for LoggingCfg` returning the same defaults. AC-12 automatic via `Config::default()` → `toml::to_string_pretty` at `crates/kebab-app/src/lib.rs:142, 178` (`kebab init` path).
+
+- [ ] **5.3 Failing cleanup tests** in `ingest_log::tests`:
+  - `cleanup_keeps_recent_n_drops_old` — 5 files, 3 fresh + 2 sixty-days-old; `cleanup_old_logs(dir, 3, 30)` → 3 freshest survive.
+  - `cleanup_drops_stale_even_within_count` — 2 files, both `keep_recent=10` but 90 days old; `cleanup_old_logs(dir, 10, 30)` → all dropped (F5 OR-on-stale).
+
+  Use `filetime` crate (or std `set_file_mtime` polyfill) for backdated mtimes.
+
+- [ ] **5.4 Implement `cleanup_old_logs`** at module-level in `ingest_log.rs`:
+
+  ```rust
+  pub(crate) fn cleanup_old_logs(log_dir: &Path, keep_recent: u32, retention_days: u32) -> Result<()>;
+  ```
+
+  Body: read_dir → filter `ingest-*.ndjson` → sort by `modified()` descending → walk with index; **delete iff `(idx >= keep_recent) OR (modified <= cutoff)`**; equivalently keep iff `(idx < keep_recent) AND (modified > cutoff)`. Inline that as a comment (F5 wording fix).
+
+- [ ] **5.5 Hook into `IngestLogWriter::open`.** Before creating the new ingest-*.ndjson file, call `cleanup_old_logs(&log_dir, cfg.keep_recent_runs, cfg.retention_days)`. On error, `tracing::warn!` and continue — cleanup is non-critical (R-6 mitigation).
+
+- [ ] **5.6 SQLite prune hook** in `crates/kebab-app/src/lib.rs::ingest_with_config_opts` (near the existing `IngestLogWriter::open` call site):
+
+  ```rust
+  let _pruned = app.sqlite
+      .prune_pdf_ocr_events(app.config.logging.retention_days)
+      .unwrap_or_else(|e| {
+          tracing::warn!(target: "kebab-app", "pdf_ocr_events prune failed: {e}");
+          0
+      });
+  ```
+
+  One prune per ingest run — matches file-side cadence.
+
+- [ ] **5.7 Doc sync.** `docs/SMOKE.md` config example `[logging]` block gets the two new fields with their defaults. README / HANDOFF / ARCHITECTURE: skip — no user-visible surface beyond CLI inspect (covered in Step 4) and config keys (SMOKE-only).
+
+- [ ] **5.8 Verify.** `cargo test -p kebab-config -- logging` + `cargo test -p kebab-app --lib ingest_log::tests` + `cargo test -p kebab-store-sqlite --test pdf_ocr_events_insert_smoke record_and_prune`.
+
+- [ ] **5.9 Commit.**
+
+  ```
+  feat(app): log retention — keep_recent_runs + retention_days (Enhancement 4)
+
+  LoggingCfg gains two fields with serde defaults: keep_recent_runs
+  (default 100, top-N file retention) and retention_days (default 30,
+  time-based retention for both ndjson files and the SQLite mirror).
+
+  IngestLogWriter::open now runs cleanup_old_logs before creating a new
+  ingest-*.ndjson — delete iff (idx >= keep_recent) OR (modified <=
+  cutoff). ingest_with_config_opts also calls
+  SqliteStore::prune_pdf_ocr_events(retention_days) at ingest start so
+  the SQLite mirror tracks the same retention window.
+
+  Backward compat (AC-9): both new fields use #[serde(default = ...)],
+  so a pre-v0.20.x config with only [logging] ingest_log_enabled +
+  ingest_log_dir parses unchanged. kebab init writes the new defaults
+  automatically via Config::default() → toml::to_string_pretty (AC-12).
+
+  docs/SMOKE.md config example synced.
+
+  Closure r1 F5: explicit OR-on-stale comment inside cleanup_old_logs.
+
+  Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
+  ```
+
+---
+
+## Step 6 — Final sanity (no commit)
+
+**Implements:** AC-10, AC-11 cumulative.
+
+- [ ] **6.1 Workspace test.**
+
+  ```bash
+  export CARGO_TARGET_DIR=/build/out/cargo-target/target
+  cargo test --workspace --no-fail-fast -j 1 > /tmp/wstest.out 2>&1
+  grep -E "^test result:" /tmp/wstest.out | awk '
+    { for(i=1;i<=NF;i++){
+        if($i=="passed;") pass+=$(i-1);
+        if($i=="failed;") fail+=$(i-1);
+      } }
+    END { print "passed:", pass, "failed:", fail }
+  '
+  ```
+
+  Expected: `passed >= 1375`, `failed = 0`.
+
+- [ ] **6.2 Clippy.** `cargo clippy --workspace --all-targets -- -D warnings` → 0 warnings.
+
+- [ ] **6.3 Wire schema additive check.** `./target/release/kebab schema --json | jq '.wire.schemas[]' | grep -E "ocr_stats|ocr_failures"` returns both strings.
+
+- [ ] **6.4 Dogfood smoke (optional).** Per `docs/SMOKE.md` against TempDir KB: ingest a scanned PDF → `kebab inspect ocr-stats --json | jq .schema_version` returns `"ocr_stats.v1"` → `sqlite3 .../kebab.sqlite 'SELECT COUNT(*) FROM pdf_ocr_events'` non-zero.
+
+- [ ] **6.5 `cargo fmt --all`** + `git status` confirms all intended files are staged. No commit at Step 6.
+
+---
+
+## §3 Cumulative verifier checklist (13 row)
+
+| AC | Description | Verifier | Step |
+|----|---|---|---|
+| AC-1 | image_w/h non-null on raster decode | `extract_image_dimensions_*` units + `pdf_ocr_roundtrip` (extended) | Step 1 |
+| AC-2 | V008 table exists post-migration | `v008_pdf_ocr_events_table_exists` | Step 2 |
+| AC-3 | ndjson ↔ SQLite row count + doc_id match | `ingest_dual_write_doc_id_matches_ndjson` | Step 3 |
+| AC-4 | `inspect ocr-stats --json` schema_version | `ocr_stats_after_scanned_pdf_ingest` | Step 4 |
+| AC-5 | `inspect ocr-failures --doc-id <id>` returns rows | `ocr_failures_filter_by_doc_id` (F1 makes this passable) | Step 3 + Step 4 |
+| AC-6 | `inspect ocr-failures --json` corpus-wide | sibling assertion in inspect smoke | Step 4 |
+| AC-7 | keep_recent_runs=N → oldest deleted | `cleanup_keeps_recent_n_drops_old` | Step 5 |
+| AC-8 | retention_days=0 → SQLite old rows deleted | `record_and_prune_pdf_ocr_event` | Step 2 + Step 5 hook |
+| AC-9 | old config parses with defaults | `old_logging_config_parses_with_defaults` | Step 5 |
+| AC-10 | workspace test + clippy green | Step 6 final sanity | Step 6 |
+| AC-11 | new integration test binaries | `ocr_inspect_smoke` + `pdf_ocr_events_insert_smoke` | Step 3 + Step 4 |
+| AC-12 | `kebab init` writes new defaults | auto via `Config::default()` → `toml::to_string_pretty` | Step 5 |
+| AC-13 | SKILL.md lists new schemas | `skill_md_lists_new_schemas` | Step 4 |
+
+---
+
+## §4 Risk → resolution map
+
+| Risk / finding | Resolution location | Plan step |
+|--|--|--|
+| R-1 dual-write race | file first, SQLite warn-only | Step 3.4 |
+| R-2 V008 rollback | spec §6 R-2 documents manual SQL | (no plan action) |
+| R-3 concurrent cleanup | cleanup only at `IngestLogWriter::open` | Step 5.4 |
+| R-4 corrupt JPEG decode | `Option` fallback | Step 1.3 |
+| R-5 old consumer reads new schema | `schema_version` skip | (schema design) |
+| R-6 concurrent cleanup vs tail | cleanup only at ingest start, top-N recent safe | Step 5.4 |
+| R-7 doc_id NULL (F1) | pre-capture `canonical.doc_id.0.clone()` | Step 3.3 |
+| G1 SqliteStore::open + double-open | `Arc::clone(&app.sqlite)` | Step 3.3 |
+| G2 facade rule violation | `*_with_config` companion pair | Step 4.5 + 4.6 |
+| G3 schema.schema.json wording | extend `WIRE_SCHEMAS` const | Step 4.2 |
+
+---
+
+## §5 Open questions for executor
+
+LOW priority — judgment calls, none block the spec contract.
+
+1. **`SqliteStore` connection accessor.** Step 4.5 reads from `self.sqlite`'s inner `Mutex<Connection>`. Probe `store.rs` for an existing `with_conn(|c| …)` closure-form accessor and prefer it (tight lock scope). If none exists, add a minimal `pub(crate) fn conn(&self) -> &Mutex<Connection>` — visibility unchanged.
+2. **p99 in `IngestSummary`.** `percentiles` now returns 4-tuple. Round 1 `IngestSummary` carries p50/p90/max only. Adding `ocr_p99_ms` is out of scope (no AC); leave it surfaced only via `inspect ocr-stats`. Executor may fold it in if the diff is one line.
+3. **`OcrStatsByDoc.p90_ms = None`.** Per-doc p90 deferred — wire schema allows `["integer", "null"]`. If a clean O(n)-per-doc sort fits, executor may implement; otherwise leave `None`.
+4. **JPEG fixture.** Step 1.2 commits a 16x12 JPEG. If `fixtures/` already carries a comparable small JPEG, reuse + adjust assertions.
+5. **`ingest_log_smoke` adjustment.** Step 3.5 likely needs assertion tweaks for the new `doc_id` field — light touch (`Option` field omitted when None).
+6. **Failure-producing PDF fixture for AC-5.** If no fixture reliably produces an OCR failure, mark `ocr_failures_filter_by_doc_id` as `#[ignore]` with a TODO; the synthetic-row coverage in `record_and_prune_pdf_ocr_event` still exercises the WHERE-doc_id path.
+
+---
+
+## §6 References
+
+- **Spec contract:** `docs/superpowers/specs/2026-05-28-v0.20.x-logging-r2-spec.md` (751 line, ACCEPT, frozen).
+- **Critic r1:** `.omc/reviews/2026-05-28-v0.20.x-logging-r2-spec-closure-result.md` (6 finding, applied in r1c).
+- **Critic r2:** `.omc/reviews/2026-05-28-v0.20.x-logging-r2-spec-closure-r2-result.md` (3 G-finding, plan-level resolution above).
+- **Parent design:** `docs/superpowers/specs/2026-04-27-kebab-final-form-design.md` (§8 dep graph, §9 version cascade).
+- **Round 1 spec:** `docs/superpowers/specs/2026-05-28-v0.20-ingest-log-spec.md` (frozen).
+- **PDF OCR spec:** `docs/superpowers/specs/2026-05-27-pdf-scanned-ocr-spec.md` (frozen).
+- **Branch:** `feat/ingest-log-round2-enhancements` (HEAD `89d334a`).
+- **HOTFIXES:** `tasks/HOTFIXES.md` — any post-merge deviations land here.
+- **CLAUDE.md sections:** §The facade rule (G2), §Versioning cascade (additive minor → no release trigger), §Naming + paths.
+
+---
+
+## §7 Constraints
+
+1. **No branch change.** All 5 commits land on `feat/ingest-log-round2-enhancements`.
+2. **Spec frozen.** No edits to the ACCEPT spec from this plan. Deviations → `tasks/HOTFIXES.md`.
+3. **Wire schema additive minor.** Two new `*.v1` schemas + two new `WIRE_SCHEMAS` entries. No major bump.
+4. **Regression budget 0.** Baseline 1370 workspace tests stay green; round 2 adds ≥5 new.
+5. **Worker protocol — subagent skip.** Executor runs in a single subagent-driven-development pass without spawning nested workers.
+6. **Length budget.** 500-700 line plan (this file ≈ 600).
+7. **Build path.** `export CARGO_TARGET_DIR=/build/out/cargo-target/target`; `-j 4` default, `-j 1` for the workspace sanity pass.
+8. **Commit cadence.** 5 commits (Steps 1-5). Step 6 verify-only.
+9. **Doc sync.** README untouched (no surface beyond `inspect` subcommands — append to README's 명령 table only if it already lists `inspect`); HANDOFF gets one line post-merge if load-bearing; ARCHITECTURE untouched; SMOKE config example updated in Step 5.7.
+10. **Release trigger.** Wire additive minor → NOT a release trigger per CLAUDE.md §Versioning cascade. Defer bump to a dogfood-driven `chore: bump 0.20.x → 0.20.y` later.
--- a/docs/superpowers/specs/2026-05-28-v0.20.x-logging-r2-spec.md
+++ b/docs/superpowers/specs/2026-05-28-v0.20.x-logging-r2-spec.md
@@ -0,0 +1,751 @@
+---
+title: v0.20.x ingest log round 2 — 4 enhancement spec
+created: 2026-05-28
+status: DRAFT round 0
+parent_spec: 2026-04-27-kebab-final-form-design.md
+target_version: v0.20.x
+branch: feat/ingest-log-round2-enhancements
+---
+
+# v0.20.x ingest log round 2
+
+## §1 Motivation
+
+### §1.1 Sweet-spot analysis — progressive dogfood tuning
+
+v0.20.0 sub-item 1 의 round 1 ingest log (PR #189 merged) 는 per-run ndjson 의 file-only logging 으로 배포. 3개월 실사용(dogfood) 중 OCR engine 의 timeout / performance sweet-spot 을 점진적으로 조정할 필요.
+
+- **현재 상태**: 각 ingest run 의 OCR 샘플(ms, success/fail) 이 ndjson file 에만 기록 → historical aggregate query 불가 (per-run 단위).
+- **요구**: 누적 데이터베이스에서 p90 / p99 / 극값 을 조회 → timeout default 축소(e.g. 300s → 180s) 결정 가능.
+- **해결**: SQLite `pdf_ocr_events` mirror table — v0.20.x round 2 주요 enhancement.
+
+### §1.2 Image dimension 결함 — null emit 문제
+
+`crates/kebab-app/src/pdf_ocr_apply.rs` 의 6개 emit point (line 155, 188, 265 등) 에서 `image_width: None, image_height: None` hardcode.
+- **현재**: raster JPEG 가 memory 에 있으나 dimension 측정 미수행.
+- **영향**: wire schema 의 optional field 이지만, 실제 use case (e.g. "100MB+ 이미지만 timeout 조정") 를 위해 필수 데이터.
+- **fix**: raster decode via `image` crate (transitive dep via `kebab-parse-image`).
+
+### §1.3 CLI inspect subcommands — 운영 visibility
+
+ndjson log 는 human-readable 이지만, 스크립트/automation 용 corpus-wide 통계가 부족.
+- `kebab inspect ocr-stats --json` — 전체 OCR 성공률, p50/p90/p99 latency, engine 별 breakdown.
+- `kebab inspect ocr-failures --doc-id <id> --json` — 특정 doc 의 failure history.
+- `kebab inspect ocr-failures --json` — 최근 failure 나열 (corpus-wide).
+
+### §1.4 Log retention — 무한 증가 방지
+
+ingest 가 반복되면서 `~/.local/state/kebab/logs/ingest-*.ndjson` file 누적.
+- **현재**: 수동 정리 필수.
+- **요구**: 자동 cleanup — `keep_recent_runs` (e.g. 100) + `retention_days` (e.g. 30).
+- **적용**: SQLite `pdf_ocr_events` 도 동일한 retention 정책 적용.
+
+---
+
+## §2 Scope + non-scope
+
+### §2.1 Included
+
+**Enhancement 1: image_width + image_height capture (trivial)**
+- raster JPEG dimension decode in `pdf_ocr_apply.rs` 6 emit point.
+- image crate import (already transitive).
+- Some(u32) 로 fill.
+
+**Enhancement 2: SQLite mirror — pdf_ocr_events table (medium)**
+- V008 migration: `pdf_ocr_events` table 신규 (run_id, ts, doc_id, page, image_byte_size, image_width, image_height, ms, chars, success, reason, ocr_engine).
+- index: run_id, doc_id, ts.
+- insert path: `IngestLogWriter` 에서 file ndjson + SQLite 동시 write (dual-write).
+- SqliteStore::record_pdf_ocr_event(…) API.
+
+**Enhancement 3: CLI inspect commands (medium)**
+- `kebab inspect ocr-stats --json` — corpus-wide aggregate (total_events, success_count, failure_count, p50/p90/p99_ms, by_engine, top 10 docs by failure).
+- `kebab inspect ocr-failures --doc-id <id> --json` — single doc failure list.
+- `kebab inspect ocr-failures --json` (no doc-id) — corpus-wide recent failures (--limit configurable).
+- wire schemas: `ocr_stats.v1` + `ocr_failures.v1` (additive minor to schema.v1).
+
+**Enhancement 4: log retention + rotation (low)**
+- `[logging] keep_recent_runs: u32` (default 100) + `retention_days: u32` (default 30).
+- file cleanup: IngestLogWriter::open 시 prune helper 호출.
+- SQLite cleanup: SqliteStore::prune_pdf_ocr_events(retention_days).
+- backward compat: old config (no `[logging]` fields) parses with default.
+
+### §2.2 Out of scope
+
+- wire schema public API (pdf_ocr_events 는 internal SQLite table, wire expose 안 함).
+- `ask` 명령의 한국어 phrasing-sensitive refusal (이번 round 범위 외).
+- migration rollback automation (standard CLAUDE.md protocol follow).
+- concurrent ingest lock manager (현재 single-process ingest 가정, future spec).
+
+---
+
+## §3 Design decisions
+
+### §3.1 image_width / image_height — raster decode path
+
+**선택**: raster JPEG 를 ImageReader 로 decode → (width, height) 추출.
+- **이유**: OCR 호출 시 bytes 가 이미 memory (extract_dctdecode_page_image), decode latency << OCR latency (negligible <1ms).
+- **대안 거절**: PDF MediaBox 사용 → actual raster 와 page size 다를 수 있음 (less accurate).
+- **구현**: `image` crate 의 `ImageReader::new(Cursor::new(&bytes)).with_guessed_format()?.into_dimensions()?`.
+- **error handling**: decode fail → (None, None) fallback. OCR 결과는 여전히 valid.
+
+### §3.2 SQLite mirror — V008 migration + dual-write
+
+**선택**: v0.20.0 round 1 의 file-only ndjson 을 보완하는 SQLite mirror (non-breaking).
+- **이유**: historical query 를 위해 structured storage 필수. file 만으로는 corpus-wide aggregate 불가.
+- **doc_id wiring**: LogEvent::Ocr 의 `doc_id` field 는 closure scope 에서 미리 capture 되어야 함. apply_ocr_to_pdf_pages 호출 전에 canonical.doc_id 를 local var 로 binding 후, closure 내에서 동일한 doc_id 로 file ndjson + SQLite insert 수행. 이를 통해 dual-write 의 일관성 보장.
+- **dual-write 구조**:
+  1. `IngestLogWriter::write_event(&LogEvent::Ocr)` 시 file ndjson + SQLite insert.
+  2. insert 는 `Arc<SqliteStore>` clone 을 emit_progress closure 가 직접 호출.
+  3. transaction safety: file write first (failures → log), then SQLite (non-critical).
+- **non-breaking**: old config 가 없어도 logging 정상 작동 (file only). SQLite 는 upgrade 시 자동 생성.
+
+### §3.3 CLI inspect commands — ocr-stats + ocr-failures
+
+**wire schema**: 기존 `schema.v1` 의 `wire.schemas` list 에 `ocr_stats.v1` + `ocr_failures.v1` additive minor 추가.
+- **이유**: 새 wire shape 은 public API 가 아님 (inspect command 만 emit). wire.v1 의 확장으로 additive.
+- **구현**: `kebab-cli/src/main.rs` 의 `Subcommand::Inspect` 에 `InspectCommand::OcrStats / OcrFailures` arm 추가.
+
+### §3.4 retention — keep_recent_runs + retention_days
+
+**선택**: 두 조건 모두 충족 시만 보존 (OR-on-stale = AND-on-fresh semantics).
+- **이유**: 
+  - `keep_recent_runs=100` — deterministic "최근 N 개 run 보존".
+  - `retention_days=30` — time-based cleanup (dogfood 중단 후 obsolete log 자동 삭제).
+  - **Delete if** (idx >= keep_recent) **OR** (modified <= cutoff) — 둘 중 하나라도 stale 시 삭제. 동등: **Keep iff** (idx < keep_recent) **AND** (modified > cutoff) — 둘 다 fresh 일 때만.
+- **구현**: `IngestLogWriter::open()` 시 cleanup helper, `SqliteStore::prune_pdf_ocr_events(retention_days)` 별도 routine.
+
+---
+
+## §4 Implementation specification
+
+### §4.1 image_width / image_height decode helper
+
+**파일**: `crates/kebab-app/src/pdf_ocr_apply.rs`
+
+**변경**:
+1. `crates/kebab-app/Cargo.toml` dependency update:
+   ```diff
+   -image = { version = "0.25", default-features = false, features = ["png"] }
+   +image = { version = "0.25", default-features = false, features = ["png", "jpeg"] }
+   ```
+2. import `use image::io::Reader as ImageReader;` (transitive via kebab-parse-image).
+3. 새 helper function:
+   ```rust
+   fn extract_image_dimensions(jpeg_bytes: &[u8]) -> Option<(u32, u32)> {
+       let reader = ImageReader::new(std::io::Cursor::new(jpeg_bytes))
+           .ok()?
+           .with_guessed_format()
+           .ok()?;
+       reader.into_dimensions().ok()
+   }
+   ```
+4. 6 emit point (line 155, 188, 265 및 PdfOcrProgress::Finished 의 다른 3곳):
+   ```rust
+   let (w, h) = extract_image_dimensions(&page_image_bytes).map(|(w, h)| (Some(w), Some(h)))
+       .unwrap_or((None, None));
+   emit_progress(PdfOcrProgress::Finished {
+       image_width: w,
+       image_height: h,
+       ...
+   });
+   ```
+
+**test**: 기존 `pdf_ocr_roundtrip` + 새 `pdf_ocr_image_dimensions` integration test.
+
+### §4.2 V008 migration SQL + SqliteStore API
+
+**파일**: `migrations/V008__pdf_ocr_events.sql` (신규)
+
+```sql
+CREATE TABLE pdf_ocr_events (
+  id          INTEGER PRIMARY KEY,
+  run_id      TEXT NOT NULL,
+  ts          TEXT NOT NULL,             -- ISO 8601 UTC (RFC 3339)
+  doc_id      TEXT,                       -- nullable (file detect skip)
+  doc_path    TEXT NOT NULL,
+  page        INTEGER NOT NULL,
+  image_byte_size  INTEGER,
+  image_width      INTEGER,
+  image_height     INTEGER,
+  ms          INTEGER NOT NULL,
+  chars       INTEGER NOT NULL,
+  success     INTEGER NOT NULL,           -- 0 = fail, 1 = success
+  reason      TEXT,                       -- "timeout" / "ocr_error" / NULL
+  ocr_engine  TEXT NOT NULL
+);
+CREATE INDEX idx_pdf_ocr_events_doc_id ON pdf_ocr_events(doc_id);
+CREATE INDEX idx_pdf_ocr_events_run_id ON pdf_ocr_events(run_id);
+CREATE INDEX idx_pdf_ocr_events_ts ON pdf_ocr_events(ts);
+```
+
+**파일**: `crates/kebab-store-sqlite/src/lib.rs` (SqliteStore 확장)
+
+**신규 method** (Mutex lock 명시):
+```rust
+impl SqliteStore {
+    pub fn record_pdf_ocr_event(
+        &self,
+        run_id: &str,
+        ts: &str,
+        doc_id: Option<&str>,
+        doc_path: &str,
+        page: u32,
+        image_byte_size: Option<u64>,
+        image_width: Option<u32>,
+        image_height: Option<u32>,
+        ms: u64,
+        chars: u32,
+        success: bool,
+        reason: Option<&str>,
+        ocr_engine: &str,
+    ) -> anyhow::Result<()> {
+        let conn = self.conn.lock().expect("sqlite lock poisoned");
+        conn.execute(
+            "INSERT INTO pdf_ocr_events
+             (run_id, ts, doc_id, doc_path, page, image_byte_size, image_width, image_height, ms, chars, success, reason, ocr_engine)
+             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
+            rusqlite::params![
+                run_id, ts, doc_id, doc_path, page,
+                image_byte_size, image_width, image_height, ms, chars,
+                if success { 1 } else { 0 }, reason, ocr_engine
+            ]
+        )?;
+        Ok(())
+    }
+
+    pub fn prune_pdf_ocr_events(&self, retention_days: u32) -> anyhow::Result<u64> {
+        let conn = self.conn.lock().expect("sqlite lock poisoned");
+        let cutoff_ts = time::OffsetDateTime::now_utc()
+            .checked_sub(time::Duration::days(retention_days as i64))
+            .map(|dt| dt.format(&time::format_description::well_known::Rfc3339).ok())
+            .flatten()
+            .unwrap_or_default();
+        let n = conn.execute(
+            "DELETE FROM pdf_ocr_events WHERE ts < ?",
+            rusqlite::params![cutoff_ts],
+        )?;
+        Ok(n as u64)
+    }
+}
+```
+
+### §4.3 wire schema — ocr_stats.v1 + ocr_failures.v1
+
+**파일**: `docs/wire-schema/v1/ocr_stats.schema.json` (신규)
+
+```json
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "ocr_stats.v1",
+  "type": "object",
+  "properties": {
+    "schema_version": { "const": "ocr_stats.v1" },
+    "total_events": { "type": "integer" },
+    "total_runs": { "type": "integer" },
+    "success_count": { "type": "integer" },
+    "failure_count": { "type": "integer" },
+    "success_rate": { "type": "number" },
+    "p50_ms": { "type": "integer" },
+    "p90_ms": { "type": "integer" },
+    "p99_ms": { "type": "integer" },
+    "max_ms": { "type": "integer" },
+    "by_engine": { "type": "object", "additionalProperties": { "type": "integer" } },
+    "by_doc": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "properties": {
+          "doc_id": { "type": "string" },
+          "failure_count": { "type": "integer" },
+          "success_count": { "type": "integer" },
+          "p90_ms": { "type": ["integer", "null"] }
+        }
+      }
+    }
+  },
+  "required": ["schema_version", "total_events", "total_runs", "success_count", "failure_count", "success_rate"]
+}
+```
+
+**파일**: `docs/wire-schema/v1/ocr_failures.schema.json` (신규)
+
+```json
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "ocr_failures.v1",
+  "type": "object",
+  "properties": {
+    "schema_version": { "const": "ocr_failures.v1" },
+    "doc_id": { "type": ["string", "null"] },
+    "failure_count": { "type": "integer" },
+    "failures": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "properties": {
+          "ts": { "type": "string" },
+          "page": { "type": "integer" },
+          "ms": { "type": "integer" },
+          "reason": { "type": "string" },
+          "image_byte_size": { "type": ["integer", "null"] }
+        }
+      }
+    }
+  },
+  "required": ["schema_version", "failure_count", "failures"]
+}
+```
+
+**파일**: `docs/wire-schema/v1/schema.schema.json` 갱신
+
+`schema.v1.wire.schemas` list 에 `ocr_stats.v1` + `ocr_failures.v1` 추가 (additive).
+
+### §4.4 CLI inspect ocr-stats + ocr-failures
+
+**파일**: `crates/kebab-cli/src/main.rs`
+
+**신규 subcommand**:
+```rust
+#[derive(Subcommand)]
+pub enum Subcommand {
+    Inspect(InspectCommand),
+    // ...
+}
+
+#[derive(clap::Subcommand)]
+pub enum InspectCommand {
+    OcrStats {
+        #[arg(long, default_value = "false")]
+        json: bool,
+    },
+    OcrFailures {
+        #[arg(long)]
+        doc_id: Option<String>,
+        #[arg(long, default_value = "10")]
+        limit: usize,
+        #[arg(long, default_value = "false")]
+        json: bool,
+    },
+}
+```
+
+**파일**: `crates/kebab-app/src/lib.rs` 확장
+
+```rust
+impl App {
+    pub fn inspect_ocr_stats(&self) -> anyhow::Result<OcrStatsV1> {
+        // SELECT 쿼리: pdf_ocr_events 에서 aggregate.
+        // 1. total_events, success_count, failure_count, success_rate 계산.
+        // 2. percentile via in-memory sort: SELECT ms FROM pdf_ocr_events WHERE success=1 ORDER BY ms.
+        //    Vec 로 fetch 후 idx 계산 (p50 = idx 50%, p90 = idx 90%, p99 = idx 99%).
+        // 3. by_engine groupby (engine 별 success count).
+        // 4. by_doc top 10 (failure_count DESC).
+    }
+
+    pub fn inspect_ocr_failures(
+        &self,
+        doc_id: Option<&str>,
+        limit: usize,
+    ) -> anyhow::Result<OcrFailuresV1> {
+        // SELECT failure records WHERE success=0.
+        // doc_id 있으면 WHERE doc_id=?; 없으면 ORDER BY ts DESC LIMIT limit.
+    }
+}
+```
+
+### §4.5 retention cleanup helper — file + SQLite
+
+**파일**: `crates/kebab-app/src/ingest_log.rs` 확장
+
+```rust
+impl IngestLogWriter {
+    pub fn open(cfg: &kebab_config::LoggingCfg) -> anyhow::Result<Option<Self>> {
+        if !cfg.ingest_log_enabled {
+            return Ok(None);
+        }
+        let run_id = generate_run_id();
+        let log_dir = expand_log_dir(&cfg.ingest_log_dir);
+        std::fs::create_dir_all(&log_dir)?;
+
+        // Cleanup file logs (before creating new log).
+        if let Err(e) = Self::cleanup_old_logs(&log_dir, cfg.keep_recent_runs, cfg.retention_days) {
+            tracing::warn!(target: "kebab-app", "ingest log cleanup failed: {e}");
+            // non-critical — continue without failing ingest.
+        }
+
+        let path = log_dir.join(format!("ingest-{run_id}.ndjson"));
+        let file = BufWriter::new(File::create(&path)?);
+        Ok(Some(Self { file, path, run_id, started_at: SystemTime::now() }))
+    }
+
+    fn cleanup_old_logs(log_dir: &Path, keep_recent: u32, retention_days: u32) -> anyhow::Result<()> {
+        let mut entries: Vec<_> = std::fs::read_dir(log_dir)?
+            .filter_map(|e| e.ok())
+            .filter(|e| e.path().file_name()
+                .and_then(|n| n.to_str())
+                .map(|s| s.starts_with("ingest-") && s.ends_with(".ndjson"))
+                .unwrap_or(false))
+            .collect();
+
+        // Sort by modified time descending (newest first).
+        entries.sort_by_key(|e| std::cmp::Reverse(e.metadata().ok().and_then(|m| m.modified().ok())));
+
+        let cutoff_time = SystemTime::now() - std::time::Duration::from_secs(retention_days as u64 * 86400);
+
+        for (idx, entry) in entries.into_iter().enumerate() {
+            let path = entry.path();
+            let metadata = entry.metadata()?;
+            let modified = metadata.modified()?;
+
+            // Delete if (idx >= keep_recent) OR (modified <= cutoff).
+            // Equivalent: keep iff (idx < keep_recent) AND (modified > cutoff) — both fresh.
+            // Per §3.4 OR-on-stale semantics.
+            if idx < keep_recent as usize && modified > cutoff_time {
+                continue;
+            }
+
+            std::fs::remove_file(&path)
+                .map_err(|e| anyhow::anyhow!("failed to remove {}: {}", path.display(), e))?;
+        }
+
+        Ok(())
+    }
+}
+```
+
+### §4.6 Config extension — LoggingCfg
+
+**파일**: `crates/kebab-config/src/lib.rs` (LoggingCfg 확장)
+
+```rust
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct LoggingCfg {
+    pub ingest_log_enabled: bool,
+    pub ingest_log_dir: PathBuf,
+    #[serde(default = "default_keep_recent_runs")]
+    pub keep_recent_runs: u32,
+    #[serde(default = "default_retention_days")]
+    pub retention_days: u32,
+}
+
+fn default_keep_recent_runs() -> u32 { 100 }
+fn default_retention_days() -> u32 { 30 }
+
+impl Default for LoggingCfg {
+    fn default() -> Self {
+        Self {
+            ingest_log_enabled: true,
+            ingest_log_dir: PathBuf::from("{state_dir}/logs"),
+            keep_recent_runs: 100,
+            retention_days: 30,
+        }
+    }
+}
+```
+
+**파일**: `docs/SMOKE.md` — config example 갱신
+
+```toml
+[logging]
+ingest_log_enabled = true
+ingest_log_dir = "{state_dir}/logs"
+keep_recent_runs = 100
+retention_days = 30
+```
+
+### §4.7 IngestLogWriter dual-write integration — canonical.doc_id closure capture (F1)
+
+**파일**: `crates/kebab-app/src/ingest_log.rs` — write_event 확장
+
+```rust
+impl IngestLogWriter {
+    pub fn write_event_with_db(
+        &mut self,
+        event: &LogEvent<'_>,
+        store: Option<&SqliteStore>,
+    ) -> anyhow::Result<()> {
+        // Write to file.
+        serde_json::to_writer(&mut self.file, event)?;
+        writeln!(self.file)?;
+
+        // Write to SQLite if store provided and event is Ocr.
+        if let (Some(store), LogEvent::Ocr {
+            ts, doc_id, doc_path, page, image_byte_size, image_width, image_height,
+            ms, chars, success, reason, ocr_engine,
+        }) = (store, event) {
+            let _ = store.record_pdf_ocr_event(
+                self.run_id(),
+                ts,
+                doc_id.as_deref(), // doc_id must be captured in closure scope (see below)
+                doc_path,
+                *page,
+                *image_byte_size,
+                *image_width,
+                *image_height,
+                *ms,
+                *chars,
+                *success,
+                *reason,
+                ocr_engine,
+            ).map_err(|e| {
+                // Non-critical — log warning but don't fail ingest.
+                tracing::warn!(target: "kebab-app", "sqlite ocr event insert failed: {e}");
+            });
+        }
+
+        Ok(())
+    }
+}
+```
+
+**caller 예시** (kebab-app/src/ingest_one_pdf_asset 또는 apply_ocr_to_pdf_pages 내 emit_progress closure):
+
+```rust
+// Pre-capture canonical.doc_id before apply_ocr_to_pdf_pages closure:
+let doc_id_for_log: String = canonical.doc_id.0.clone();
+let doc_path_for_log = asset.workspace_path.0.clone();
+
+let store = Arc::new(SqliteStore::open(&cfg.storage.sqlite)?);
+let mut log_writer = IngestLogWriter::open(&cfg.logging)?;
+
+let emit_progress = move |progress: PdfOcrProgress| {
+    if let Some(writer) = &mut log_writer {
+        let event = LogEvent::Ocr {
+            ts: now_ts(),
+            doc_id: Some(doc_id_for_log.clone()),  // ← captured in closure scope
+            doc_path: doc_path_for_log.clone(),
+            page: page_n,
+            // ... other fields ...
+        };
+        let _ = writer.write_event_with_db(&event, Some(&store));
+    }
+};
+```
+
+---
+
+## §5 Acceptance criteria
+
+**AC-1**: image_width + image_height non-null after PDF OCR.
+- Integration test: scanned PDF 로 `ingest_one_pdf_asset` → IngestReport check `pdf_ocr_summary.pages_ocrd > 0`, log file 의 `image_width: Some(_)`, `image_height: Some(_)` verify.
+
+**AC-2**: V008 migration successful + `pdf_ocr_events` table exists.
+- test: fresh DB 생성 → migration apply → `SELECT name FROM sqlite_master WHERE type='table' AND name='pdf_ocr_events';` verify.
+
+**AC-3**: ingest 시 SQLite row 가 ndjson file 의 OCR record 와 1:1 일치.
+- Integration test: ingest 후 `SELECT COUNT(*) FROM pdf_ocr_events WHERE success=1` = ndjson 의 `success=true` OCR line count.
+
+**AC-4**: `kebab inspect ocr-stats --json` 정상 emit + `ocr_stats.v1` schema_version.
+- CLI test: `kebab inspect ocr-stats --json | jq '.schema_version'` = `"ocr_stats.v1"`, `total_events`, `success_rate` present.
+
+**AC-5**: `kebab inspect ocr-failures --doc-id <id> --json` 정상 emit + `ocr_failures.v1`.
+- CLI test: failure 가 있는 doc_id 로 조회 → `failures[]` array non-empty, `reason` field present.
+
+**AC-6**: `kebab inspect ocr-failures --json` (no doc-id) corpus-wide.
+- CLI test: `--limit 5` 로 최근 5개 failure 반환, `failure_count >= 5`.
+
+**AC-7**: log retention — keep_recent_runs=2 시 3rd ingest 후 oldest file deleted.
+- Integration test: temp log dir, 3 ingest run with `keep_recent_runs=2` → oldest 2 file only remain.
+
+**AC-8**: SQLite retention — retention_days=0 시 old row deleted.
+- test: insert old row (ts = 90 days ago) → `prune_pdf_ocr_events(0)` → row deleted.
+
+**AC-9**: backward compat — old config (no `[logging] retention_*` field) parses with default.
+- test: pre-v0.20.x config (no `[logging]` section) → load → `logging.keep_recent_runs == 100` (default).
+
+**AC-10**: workspace test + clippy green.
+- `cargo test --workspace -j 1`, `cargo clippy --all-targets`.
+
+**AC-11**: integration test (`ocr_inspect_smoke` + `pdf_ocr_events_insert_smoke`).
+- new test binary: scanned PDF ingest → `kebab inspect ocr-stats / ocr-failures` 검증.
+- `crates/kebab-store-sqlite/tests/pdf_ocr_events_insert_smoke.rs`.
+
+**AC-12**: `[logging] retention_*` default emit in `kebab init` config.
+- test: `kebab init --config /tmp/test-cfg.toml` → `[logging] keep_recent_runs = 100` + `retention_days = 30` present.
+
+**AC-13**: wire schema additive list sync in `integrations/claude-code/kebab/SKILL.md`.
+- test: `grep -c 'ocr_stats\.v1' integrations/claude-code/kebab/SKILL.md` returns ≥1, same for `ocr_failures.v1`.
+
+---
+
+## §6 Risks + open questions
+
+### R-1 dual-write transaction safety (file vs SQLite race)
+
+**Issue**: emit_progress closure 가 file write 후 SQLite insert 실패 시, ndjson 과 DB 불일치.
+**Mitigation**: 
+- file write first (durable, may fail).
+- SQLite write second (non-critical, warn on fail, don't propagate error).
+- per-run 단위 reconciliation tool (future enhancement, not in scope).
+
+### R-2 V008 migration rollback (F6)
+
+**Issue**: user 가 v0.20.x → older version downgrade 시 V008 rolled back?
+**Mitigation**: CLAUDE.md migration policy follow. V008 은 additive table → old version 이 table ignore 하면 작동 OK. 
+**Manual rollback** (v0.19.x ↔ v0.20.x alternating dogfood):
+```sql
+DELETE FROM refinery_schema_history WHERE version=8;
+DROP TABLE IF EXISTS pdf_ocr_events;
+```
+**Out-of-scope**: v0.19.x ↔ v0.20.x alternate run 의 자동 rollback path 미제공.
+
+### R-3 prune helper 가 concurrent ingest 시 stale lock
+
+**Issue**: cleanup_old_logs 가 file 삭제 중인데 다른 process 가 write?
+**Mitigation**: 
+- cleanup 은 IngestLogWriter::open 시만 (ingest 시작 전).
+- per-process single ingest 가정 (현재 design).
+- concurrent ingest support 는 future phase.
+
+### R-4 image decode failure handling (corrupt JPEG fallback)
+
+**Issue**: JPEG 가 corrupt → extract_image_dimensions 실패.
+**Mitigation**: helper returns Option<(u32, u32)> → (None, None) fallback. OCR 완료도 유효. warning event push (optional, future enhancement).
+
+### R-5 wire schema additive minor — old consumer 의 schema 미인식
+
+**Issue**: old `kebab` binary (v0.19.x) 가 v0.20.x `kebab inspect ocr-stats` 의 output consume?
+**Mitigation**: 
+- `schema_version` = `ocr_stats.v1` explicit (old consumer 는 schema 미인식 → skip OK).
+- wire.v1 의 additive list → backward compat (old consumer 는 list 만 ignores).
+- new consumer 만 `ocr_stats.v1` / `ocr_failures.v1` 인식.
+
+### R-6 Concurrent cleanup 에 의한 log file loss
+
+**Issue**: keep_recent_runs / retention_days 정책 으로 파일 삭제 중 user 가 tail 시도?
+**Mitigation**: cleanup 은 ingest start 때만. user 가 tail 하는 중인 파일은 일반적으로 recent (top N 내) → 안전.
+
+### R-7 doc_id NULL wiring in LogEvent::Ocr closure (F1)
+
+**Issue**: emit_progress closure 에서 doc_id 가 None 또는 mismatch 시, file ndjson 과 SQLite record 의 doc_id 가 불일치.
+**Verification** (spec §6 R-7 add):
+```bash
+# canonical.doc_id 가 set 되는 시점 확인
+grep -n "canonical.doc_id\|\.doc_id\s*=" crates/kebab-app/src/lib.rs | head -10
+```
+**Mitigation**:
+- closure scope 에서 doc_id 를 pre-capture (let doc_id_for_log: String = canonical.doc_id.0.clone()).
+- LogEvent::Ocr 생성 시 captured value 사용.
+- per-run integration test 에서 file ndjson 의 doc_id 와 SQLite SELECT 의 doc_id match verify.
+
+---
+
+## §7 References
+
+- **Parent spec**: `docs/superpowers/specs/2026-04-27-kebab-final-form-design.md` (design contract).
+- **Round 1 spec**: v0.20.0 sub-item 1 ingest log (PR #189).
+- **Code ranges**:
+  - `crates/kebab-app/src/pdf_ocr_apply.rs` lines 155, 188, 265 (6 emit point).
+  - `crates/kebab-app/src/ingest_log.rs` (LogEvent, IngestLogWriter).
+  - `crates/kebab-config/src/lib.rs` (Config, LoggingCfg).
+  - `crates/kebab-store-sqlite/src/lib.rs` (SqliteStore).
+  - `crates/kebab-cli/src/main.rs` (Subcommand).
+- **Dependencies**:
+  - `image` crate (transitive via kebab-parse-image).
+  - `time` crate (RFC 3339 timestamp, already in workspace).
+  - `rusqlite` (already in kebab-store-sqlite).
+- **Config sections**:
+  - `[logging]`: ingest_log_enabled, ingest_log_dir, keep_recent_runs, retention_days.
+  - `[pdf.ocr]`: (unchanged from v0.20.0).
+- **Wire schemas**:
+  - `docs/wire-schema/v1/ocr_stats.schema.json` (신규).
+  - `docs/wire-schema/v1/ocr_failures.schema.json` (신규).
+  - `docs/wire-schema/v1/schema.schema.json` (additive: wire.schemas list 에 두 schema 추가).
+- **HOTFIXES contract**: 새로운 deviations 는 `tasks/HOTFIXES.md` 에 dated entry + cross-link to this spec.
+- **Version cascade**: image_width/height, SQLite table schema 추가는 index_version cascade 아님 (chunks/embeddings 미영향).
+- **Backward compat**: old config parses with `[logging]` defaults, wire schema additive minor.
+
+---
+
+## §8 Dependencies + imports
+
+### Allowed dependencies
+
+- `image` crate (for ImageReader::new, into_dimensions).
+- `time` crate (RFC 3339 formatting, already in workspace).
+- `rusqlite` (for SQL execute / query, already in kebab-store-sqlite).
+- `serde_json` (for wire schema export, already in kebab-app).
+
+### Forbidden dependencies
+
+- **None new introduced.** All uses are transitive or workspace-existing.
+
+---
+
+## §9 Testing strategy
+
+### Unit tests
+
+- `extract_image_dimensions` helper: valid JPEG → Some((w, h)), corrupt JPEG → None.
+- `cleanup_old_logs`: keep_recent_runs / retention_days logic, file deletion.
+- LoggingCfg defaults: serde round-trip, backward compat.
+
+### Integration tests
+
+**New test files**:
+- `crates/kebab-app/tests/ocr_inspect_smoke.rs`: scanned PDF ingest → inspect ocr-stats / ocr-failures validation.
+- `crates/kebab-store-sqlite/tests/pdf_ocr_events_insert_smoke.rs`: V008 migration, dual-write, prune logic.
+
+**Existing test updates**:
+- `pdf_ocr_roundtrip` → verify image_width/height non-null.
+- `ingest_report_snapshot` → verify ocr_stats output shape.
+
+### Smoke test (docs/SMOKE.md)
+
+- `kebab ingest` with scanned PDF → `~/.local/state/kebab/logs/ingest-*.ndjson` + `pdf_ocr_events` table check.
+- `kebab inspect ocr-stats --json | jq '.schema_version'` = `"ocr_stats.v1"`.
+
+### Regression tests
+
+- 기존 1370 workspace test suite — regression 0 기대 (cleanup 은 non-critical, file-only logging 은 unchanged).
+
+---
+
+## §10 Rollout + dogfood
+
+### v0.20.x milestone
+
+1. **spec approval** (이번 round 0).
+2. **implementation** (A6 round 1, estimate 3-4 days for 4 enhancement).
+3. **review + merge** (pull request via gitea-ops).
+4. **dogfood** (user runs v0.20.x binary, accumulates OCR stats over 2-4 weeks).
+5. **data-driven tuning** (inspect ocr-stats → timeout default adjust, release note v0.20.y).
+
+### Backward compat notes
+
+- Old binary (v0.19.x) + new config (v0.20.x with `[logging] retention_*`): config parses, logging ignores new fields.
+- New binary (v0.20.x) + old config (v0.19.x without `[logging]`): defaults apply, logging works.
+- wire schema: additive, consumers ignore unknown fields.
+
+### Release notes
+
+- **wire schema additive minor** (`ocr_stats.v1`, `ocr_failures.v1` 추가) → release trigger 아님 (CLAUDE.md §Versioning cascade).
+- 사용자 도그푸딩 중 데이터 누적 후, 본격 튜닝 (e.g. timeout 조정) 에 따라 `chore: bump 0.20.x → 0.20.y` 별 commit 가능 (dogfood 결과 반영 시).
+
+---
+
+## §11 Contract stability
+
+**Locked sections** (design contract 의 일부, future changes require spec §N update):
+- wire schema `ocr_stats.v1` field list.
+- wire schema `ocr_failures.v1` field list.
+- `[logging]` config fields.
+- CLI `inspect ocr-stats / ocr-failures` output format.
+
+**Flexible sections** (implementation detail, future refactor OK):
+- `extract_image_dimensions` helper location (intra-crate 이동 가능).
+- `cleanup_old_logs` 정책 (더 sophisticated 알고리즘 가능).
+- SQLite index strategy (추가 index 가능).
+
+---
+
+## Summary
+
+v0.20.x ingest log round 2 는 round 1 의 file-only ndjson 을 4 가지로 확장:
+
+1. **image dimension capture** — raster JPEG decode (trivial).
+2. **SQLite mirror** — V008 migration + `pdf_ocr_events` table (medium).
+3. **CLI inspect** — corpus-wide OCR statistics API (medium).
+4. **log retention** — automatic cleanup (low).
+
+모두 non-breaking additive changes. backward compat 보장, wire schema minor bump, 500-800 line spec (이 문서 ≈ 700 lines).