Closes#000027. Closes#000028 (cache-leg wired).
#000027 — canonical projections persist to providence_cache
============================================================
Math/logic π* answers (arithmetic@v1, logic-kernel@v1,
time-series-quantized@v1, …) are now first-class providence rows.
Pre-fix: question → kernel → answer → return. No cache, no audit
event, no run_dag, no inspect/burn/replay surface.
Post-fix: question → cache_key (8-dim, synthetic for the three
RAG-shaped dims) → lookup → on miss persist (providence_cache row +
providence_canonical audit event + canonical run_dag) → return.
Synthetic cache_key dimensions for canonical rows (per ticket §2.2):
- source_root = sha256("pi_star_source:" + pi_star_ref)
- model_profile_hash = sha256("pi_star_model:" + pi_star_ref)
- conversation_hash = sha256("pi_star_conv:" + canonical_q + ":" + ref)
- chunking_version = literal "n/a-canonical" — chunker bumps on
wikipedia path don't stale math answers.
The other dims (question_hash, governance_policy_hash, schema_version,
canonicalization_version) are real and shared with the RAG path.
Schema: audit_mode CHECK widened to admit 'CANONICAL_PROJECTION';
verifier_method CHECK widened to admit 'canonical_projection'. New
_rebuild_providence_cache_canonical_projection migration helper
follows the existing _rebuild_providence_cache_* pattern (temp-table
dance, additive value-space, fully idempotent). Wired into connect()
migration block alongside the prior CHECK extensions.
Cache-hit policy: trust the row. Kernel-version drift is handled by
pi_star_ref bumping (synthetic source_root changes → fresh row,
prior row stays in DB but unreachable via the live cache_key).
Re-running on every hit would defeat the optimization without
adding audit value the version-pin doesn't already provide.
Policy gate: canonical_projection_preflight_persist (default True).
Operators who want the legacy transient render-only behavior set it
to False — keeps the existing canon-CLI experience for tests /
probes / scripts that don't want audit-chain entries for math
questions.
CLI render: `CANONICAL · via canonical_projection` for persisted
rows. Works through the existing cache_hit / cache_miss_then_written
render path; no new render branch needed.
`arborist canon <key> "<input>"` stays transient — direct one-shot
probe, never persists. Boundary preserved per ticket §2.6.
#000028 — multi-modality witness cache-leg
==========================================
Pre-#000027 the witness cache-leg closure always returned None;
STRICT-WITNESSED (3-of-3 byte-equal) was structurally unreachable.
Post-#000027 the closure now returns the persisted answer bytes
when a prior canonical row exists. Three-way agreement
(kernel == cache == canonicalize(LLM)) is now reachable on the
second canonical-witness call.
New test test_query_canonical_witness_reaches_strict_after_persist
covers it end-to-end: first call writes the row + KERNEL-LLM-AGREE;
second call hits cache + STRICT-WITNESSED.
Tests
=====
- tests/test_canonical_cache.py: 16 new tests covering ticket §7
acceptance criteria (cache_key shape, persist round-trip, audit
event, hit-count increments, chain integrity, pi_star version
bump orphans old row, distinct refs namespace separately,
chunking_version sentinel, governance policy invalidates lookup,
canon stays transient, synthetic source_root encodes ref).
- tests/test_canonical_projection.py: assertions updated — status
is now cache_miss_then_written / cache_hit instead of
canonical_projection. Added a transient-mode test pinning the
policy gate.
- tests/test_witness.py: status assertions updated to reflect
persistence; new STRICT-WITNESSED test.
- tests/test_directives.py: D7 audit_mode enum test now admits
CANONICAL_PROJECTION (governance event — admissibility class
added).
Full suite: 1367 passed, 36 skipped (was 1306; +61 new).
Real-shard smoke
================
$ make query Q="0.1 + 0.2" BURN=1
→ cache_miss_then_written, ~300ms wall, row written
$ make query Q="0.1 + 0.2"
→ cache_hit, ~40ms wall, hit_count++
$ make chain-check-shards
→ 0 breaks per shard
