v0.3.1

v0.3.1 — Chunk change deltas on re-ingest (BL-010)

First Phase 2 bridge item: the MuninnDB bridge (and any WatchDocuments consumer) now gets incremental chunk-delta updates on document re-ingest instead of full re-processing.

New in v0.3.1

RE_INGESTED event (spec 043 / BL-010):

• A document re-ingest (via Reprocess, ReprocessAll, or the watcher's MODIFIED path) now emits a single RE_INGESTED event on the WatchDocuments stream, carrying a per-chunk delta: ADDED / REMOVED / UNCHANGED.
• The delta is computed by content identity (a new per-chunk ContentHash sidecar = SHA-256 of the chunk's text), so a moved paragraph is UNCHANGED and repeated text collapses correctly (multiset diff).
• RE_INGESTED replaces the INGESTED(new) + DELETED(old) pair a re-ingest previously surfaced (no double-counting).
• The event carries an old→new chunk-ID map (prev_chunk_id on UNCHANGED/REMOVED deltas), so consumers can remap stored references (no orphaned bookmarks).

Embed-skip (US2):

• UNCHANGED chunks whose embedding model hasn't changed skip the expensive Ollama embedding call — the old PrefixEmbedding is copied to the new chunk ID. A model change forces re-embedding (no stale vectors).
• ACK budget verified: the diff computation is 13.7µs for a 50-chunk doc (730× under the <10ms budget).

v2 schema migration:

• Backfills ContentHash on existing chunks (ExpectedVersion 1→2). No new storage prefix; the field rides in the existing PrefixChunk JSON value.

Bridge docs:

• Upstream #560 (idempotent_id wiring) shipped by the MuninnDB maintainer; #556 (UPSERT) now unblocked at the prerequisite level.
• Phase 2 scoping notes recorded (BL-010/011/013 assessed against the codebase).

Security / quality

• 5-agent adversarial review of the implementation (concurrency, correctness, embed-skip safety, identity stability, event contract): no fatal flaws; all HIGH + MEDIUM findings fixed.
• go test -race ./... full repo green; make lint 0 issues.

Full Changelog: v0.3.0...v0.3.1