feat(ingest): asset 내부 phase 진행 로깅 (asset_chunked/expansion_progress/asset_timings) + v0.24.0

asset(문서) 단위뿐이던 ingest 진행 이벤트에 문서 내부 phase 가시성을 추가.
큰 문서가 expansion(별칭 LLM, 청크당 순차)으로 수십 분 걸려도 진행바가
1/N 에 멈춘 듯 보이던 문제 해결.

wire ingest_progress.v1 additive (backward-compat):
- asset_chunked {idx,total,chunks} — 청킹 직후, markdown/image/pdf 전 경로
- expansion_progress {idx,total,done,chunks} — expansion 루프 스로틀
  (25청크 또는 1s, 종료 시 done==chunks). 캐시 히트도 done 에 포함
- asset_timings {idx,total,parse_ms,chunk_ms,expansion_ms,embed_ms,store_ms}
  — markdown 경로 phase별 wall-clock

설계: timing 은 kebab_core::IngestItem(wire-stable) 변경을 피해 신규
AssetTimings 이벤트로 ingest_one_asset 가 직접 emit (AssetFinished 무변경).

CLI(progress.rs): 진행바 sub-message(→ N chunks / 별칭 확장 done/chunks) +
asset 종료 시 phase timing 한 줄(fmt_ms). TUI reducer no-op arm.

검증: clippy -D warnings exit 0; cargo test -p kebab-app -p kebab-cli
312 passed/0 failed. ordering-invariant 테스트 재작성 + 신규 직렬화 테스트.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/wire-schema/v1/ingest_progress.schema.json

@@ -14,6 +14,9 @@
         "scan_completed",
         "asset_started",
         "asset_finished",
+        "asset_chunked",
+        "expansion_progress",
+        "asset_timings",
         "embed_batch_started",
         "embed_batch_finished",
         "pdf_ocr_started",
@@ -33,7 +36,13 @@
       "enum": ["new", "updated", "skipped", "error"],
       "description": "asset_finished: per-asset outcome (mirrors `ingest_report.v1.items[].kind`)."
     },
-    "chunks":       { "type": "integer", "minimum": 0, "description": "asset_finished: chunk count produced for this asset." },
+    "chunks":       { "type": "integer", "minimum": 0, "description": "asset_finished / asset_chunked / expansion_progress (v0.24.0): chunk count produced for this asset." },
+    "done":         { "type": "integer", "minimum": 0, "description": "expansion_progress (v0.24.0, additive): chunks processed so far in the per-chunk alias-expansion loop (cache hits included). Throttled: emitted at most every 25 chunks or once per second, plus a final frame where done == chunks." },
+    "parse_ms":     { "type": "integer", "minimum": 0, "description": "asset_timings (v0.24.0, additive): parse phase wall-clock (ms). Markdown path only." },
+    "chunk_ms":     { "type": "integer", "minimum": 0, "description": "asset_timings (v0.24.0, additive): chunk phase wall-clock (ms). Markdown path only." },
+    "expansion_ms": { "type": "integer", "minimum": 0, "description": "asset_timings (v0.24.0, additive): alias-expansion phase wall-clock (ms). Markdown path only; 0 when expansion is disabled." },
+    "embed_ms":     { "type": "integer", "minimum": 0, "description": "asset_timings (v0.24.0, additive): embed + vector-upsert phase wall-clock (ms). Markdown path only." },
+    "store_ms":     { "type": "integer", "minimum": 0, "description": "asset_timings (v0.24.0, additive): SQLite persist phase wall-clock (ms). Markdown path only." },
     "n_chunks":     { "type": "integer", "minimum": 0, "description": "embed_batch_started / embed_batch_finished: chunks in this embedding batch." },
     "ms":           { "type": "integer", "minimum": 0, "description": "embed_batch_finished / pdf_ocr_finished: wall-clock duration (ms). pdf_ocr_finished skip path 의 의미는 mixed (DCTDecode 부재 시 0, engine 실패 시 latency-before-bail)." },
     "chars":        { "type": "integer", "minimum": 0, "description": "pdf_ocr_finished: char count of OCR result. Skip 시 0." },