feat(projections): add independently delivered graph and vector consumers

[DivyamTalwar]

Original-scope gap

Implements C02 / GAP-02, refs #51. Stacked on #61's authoritative history/all-event API. These are actual persistent vector and graph consumers, not another ID-only reference projection and not a dependency on another user product.

Implementation

• Persist finite, model-identified vectors and perform cosine search with a trusted pluggable embedder. The built-in offline baseline is explicitly lexical feature hashing, not a learned semantic-model claim.
• Persist graph entities, relation edges and per-fact supports; bounded traversal preserves another live fact's shared edge when one support is deleted.
• Give each consumer separate event receipts, contiguous watermarks, selection identities, enabled state, rebuild behavior and lag diagnostics.
• Enumerate source events independently of the reference consumer's delivered bit. Reconcile actual current authority before accepting effects and returning results.
• Scope namespace/repository/snapshot selection before scoring and graph expansion; keep stale/expired/deleted evidence out of ordinary results.
• Provide explicit coordinator, rebuild, disable, retention, backup/restore and typed capability/error APIs.

Independent-review fixes

The composed review identified TTL eligibility, corrected-validity handling, administrative generation races and an acquisition-budget mismatch. The final candidate applies current corrected fact validity plus independent expiry restrictions, fences selection/generation/enabled state inside delivery transactions, and avoids unbounded status hydration. A formerly incompatible fixture now preserves v2 ingestion rejection and tests legacy filtering separately.

The original deletion/revocation/receipt controls remain. docs/closure/C02-interfaces.md records the before/after findings, exact test scopes and remaining composition requirements.

Actual supervisor verification

Candidate 3f35c46ba91c6144aa283446299c61889394090c on parent 5dc8e4855d74042964fdbfa8074350d4ea372af3.

PYTHONPATH=$PWD python -m pytest -q -p no:cacheprovider
# 1132 passed, 0 failed, 0 skipped; 3 expected optional-provider warnings
python -m compileall -q jitmind tests
python -m pip check
python -m ruff check --no-cache --isolated --select E9,F <owned Python files>
git diff --check
# all passed

Source hashes were unchanged during the full assembled run. Actual SQLite, vector ranking, graph traversal, new history APIs, parser regressions and process/restart fixtures ran. Counts include inherited cases, not independent model-quality benchmarks.

Explicit boundaries

Structured relation assertions and embedding implementations are trusted host inputs; the offline tests make no live-provider calls. Administrative raw-store APIs are not request authentication. Managed restoration must honor the current retention ledger, and the final C01/C07/C09 composition remains separately reviewed. Resource limits are declared; no global filesystem transaction, all-backup erasure, semantic superiority or full production-release signoff is claimed.

See docs/projections.md for concrete setup and query examples. Review prerequisites first, retarget after merge and rerun CI. No automatic merge.