fix(dogfood): auto-purge stored docs for filesystem-deleted files

Files deleted from disk (rm a.md) were leaving stale documents + chunks +
embeddings in the store, surfacing as ghost citations in search/ask.
Existing purge_orphan_at_workspace_path only handled content-changed
stale (WHERE workspace_path=? AND asset_id != ?) — file deletion has no
new asset_id.

Fix: post-walker-scan sweep. Compute (stored_paths - scanned_paths),
for each candidate check filesystem existence — only purge when the
file is TRULY missing. Scope-narrowing case (file on disk but outside
include glob) is explicitly NOT purged to protect users from accidental
data loss via config edits.

Adds:
- DocumentStore::all_workspace_paths trait method + SqliteStore impl
- purge_deleted_workspace_path in store-sqlite (returns chunk_ids for
  vector delete; deletes doc CASCADE + asset row + copied storage file)
- sweep_deleted_files in kebab-app::ingest path; called once per ingest
  before the per-asset loop
- IngestReport.purged_deleted_files counter (additive, serde default)
- CLI ingest summary mentions purge count when > 0
- 2 integration tests: file_deletion_auto_purge + include_scope_narrowing_does_NOT_purge

dogfood discovery (PR #142 1B + multi-root: kebab-docs + httpx + zod
+ lodash). Per user decision: only filesystem deletion auto-purges;
scope narrowing requires explicit kebab reset.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/kebab-cli/src/main.rs

@@ -595,14 +595,20 @@ fn run(cli: &Cli) -> anyhow::Result<()> {
                 println!("{}", serde_json::to_string(&wire::wire_ingest(&report))?);
             } else {
                 let skipped_breakdown = kebab_app::render_skipped_breakdown(&report.skipped_by_extension);
+                let purged_suffix = if report.purged_deleted_files > 0 {
+                    format!("  purged {}", report.purged_deleted_files)
+                } else {
+                    String::new()
+                };
                 println!(
-                    "scanned {}  new {}  updated {}  skipped {}{}  errors {}  ({} ms)",
+                    "scanned {}  new {}  updated {}  skipped {}{}  errors {}{}  ({} ms)",
                     report.scanned,
                     report.new,
                     report.updated,
                     report.skipped,
                     skipped_breakdown,
                     report.errors,
+                    purged_suffix,
                     report.duration_ms
                 );
             }