`make query Q="0.1 + 0.2"` used to return `no_sources` because
arithmetic-shaped input has no FTS5 hits in any text shard. Two
surfaces close that gap.
**`arborist canon <key> "<input>"`** — direct π* call, no shards,
no LLM, no audit chain. Pure projection:
$ arborist canon arithmetic@v1 "0.1 + 0.2" → 3/10
$ arborist canon logic-kernel@v1 "A IMPL B" → (NOT A OR B)
$ arborist canon --list → registry contents
$ arborist canon --json arithmetic@v1 "0.1+0.2" → SHA-256 envelope
**Math/logic preflight in `arborist query`** — pure-arithmetic and
pure-propositional questions short-circuit RAG and answer through
arithmetic@v1 / logic-kernel@v1 directly. Synthetic
`audit_mode=CANONICAL_PROJECTION`, renders as
`CANONICAL · via <pi_star_ref>`:
$ arborist query "0.1 + 0.2"
0.1 + 0.2
CANONICAL · via arithmetic@v1 0.0s (projected)
3/10
$ arborist query "(NOT B) IMPL (NOT A)"
(NOT B) IMPL (NOT A)
CANONICAL · via logic-kernel@v1 0.0s (projected)
(NOT A OR B)
Sniff is conservative: pure-arithmetic shape (digits + ops, no
letters) or pure-propositional shape (uppercase atoms + reserved
keywords only). Natural-language wrapping ("what is 0.1+0.2?")
falls through to RAG. PiStarError on a shape match also falls
through — preflight is best-effort, never blocking.
Disable per-call: `--no-canonical-preflight` flag,
`policy["canonical_projection_preflight"]=False`.
No schema changes: CANONICAL_PROJECTION is a render-layer audit_mode
token. No providence_cache writes, no audit_events, no
governance_policy_hash bump. The canonical bytes ARE the answer;
SHA-256 of the bytes is the equivalence-class identity (already
committed via the π* registry).
Side housekeeping: arborist/pi_star/__init__.py docstring caught up
with reality — six concrete π*'s ship today, only tabular-pinned@v1
remains as a stub.
31 new tests (preflight sniff + dispatch, query short-circuit,
contrapositive equivalence-class collapse, CLI subcommand exit codes
and JSON envelope, --no-canonical-preflight policy gate). Full
suite: 1300 passed, 36 skipped.
russell@unturf.com
0a2e347f9c