The reachability gap turns by PROMOTION for the first time: 15 -> 14. PR-3b's
earlier turn was by deletion, which is free. This one costs 22.1s on every push,
which is exactly why it is a decision rather than a default.
THE RECOMMENDATION WAS RE-DERIVED, NOT EXECUTED — and it did not survive as
written. PR-4b recommended `teaching` on the strength of G-22:
test_ratification_ceremony.py was red on main, in `teaching`, run by no gate.
That hole was already closed a different way — G-22's fix promoted that single
file into smoke. So `teaching` would have added 9 net-new files, NONE with a
demonstrated escape, and promoting on a justification that has already been
spent is precisely the failure this arc exists to close.
Promoted on a stronger, doctrinal basis instead.
tests/test_epistemic_invariants.py enforces AGENTS.md's "Teaching and mutation
safety" non-negotiables in substance — INV-22/INV-23: an unmarked proposal and
an unmarked reviewed example default to SPECULATIVE, the status enum has exactly
its four positions, a pack-mutation proposal carries no hardening flag. Durable
corpus mutation is the one irreversible thing in this system, and the suite
guarding it ran on no pre-merge gate. That justification does not require an
incident to have happened yet, which makes it the better one.
Measured: 22.1s / 122 tests across 9 net-new files (the tenth was already on the
gate). Both invocation sites updated, GATE_SUITES extended, `teaching` removed
from UNREACHABLE_BASELINE in the same edit, ratchet lowered <= 15 to <= 14 —
the both-directions discipline that has caught this author twice.
A HOLLOW SPOT IN PIN 3 ITSELF, found by sabotage-testing the promotion rather
than trusting it. _suites_invoked_by_gate_tiers() takes the UNION of
scripts/hooks/pre-push and scripts/ci/local-ci.sh, so a suite present in either
satisfies it. Removing `teaching` from local-ci.sh alone PASSED SILENTLY: the
two scripts could drift from each other invisibly while local-ci.sh states in
prose that it runs "the same four steps as scripts/hooks/pre-push". A developer
running one would get coverage the other advertises and does not deliver.
Closed by test_the_two_gate_scripts_invoke_the_same_suites, scoped to the
numbered (n/m) gate steps — a discriminator both files already use — so it reads
the gate tier without parsing shell control flow. The identical sabotage now
fires. Verified in three directions: removed from one script (fires, and did not
before), removed from both (the pre-existing assertion fires), restored (green).
THIS IS NOT THE CI-PARITY PIN N-9 KILLED, and the distinction is recorded at the
assertion site so it cannot be re-litigated a third time. That one asserted
TEST_SUITES["smoke"] == smoke.yml and was reverted in 50fa287d because
AGENTS.md:280 makes GitHub Actions billing-locked dead signals — parity with a
dead signal buys nothing. Both scripts here are LIVE local merge bars.
Gate is now four steps: smoke + warmed_session + deductive + teaching.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wcw2pnMBwyvmNyQg4uPEt4
Two things, both surfaced by finally being able to run the tree.
## A pre-existing silent red
tests/test_lane_sha_verifier.py::TestExpectedLaneCoverage was RED on clean
main — confirmed by running it in a pristine worktree at origin/main, and the
file is untouched by any of this branch's work. deduction_serve_v1 (ADR-0256)
and curriculum_serve_v1 (ADR-0262) shipped during the generalization arc and
neither was added to EXPECTED_LANES.
The roster's `extra` assertion is a deliberate tripwire: a new lane is supposed
to fail it once so an author acknowledges the addition. Nobody did, and nothing
caught it, because that file is in neither `smoke` nor `deductive` — no local
gate and no CI job runs it. Same silent-red family as the exact-tuple pin S5
found in passing, and as the register-axis e2e tests that sat red for two days.
This commit is the acknowledgement the tripwire was asking for.
That it took running the full tree to find is the argument for the rest of this
commit.
## scripts/ci/local-ci.sh
AGENTS.md says the merge bar IS the local run. There was no single entry point
for it, and on any host without Python 3.12.13 exactly there was no local run
at all: pyproject pins requires-python == "3.12.13", so uv sync --locked fails
outright and every gate becomes unrunnable.
sh scripts/ci/local-ci.sh --tier smoke|gate|full
`gate` is the three pre-push steps; `full` is the whole tree in parallel. Suite
membership is read from core/cli_test.py::TEST_SUITES through the CLI and never
restated, so this runner cannot drift from the hook the way smoke.yml drifted
from the local list.
Interpreter contract, deliberately fail-closed: the pinned interpreter is
CANONICAL, and the runner refuses on anything else with instructions.
--allow-interpreter-fallback opts into any 3.12.x and stamps every run
NON-CANONICAL. Same discipline as ratified_ledger's missing_ok and the MLX
skip path: a degraded mode is legitimate, a degraded mode reporting itself as
the real thing is not.
Evidence recorded in the script header so the flag is not cargo-culted: the
committed-SHA / trace_hash / content_sha256 / lane-SHA pin set (119 tests) was
run on 3.12.11 and 118 passed, the one failure being the stale roster above,
which fails on 3.12.13 too. That is evidence the exact pin is not load-bearing
for bit-exactness — it is NOT a ruling that it should be relaxed. Relaxing it
is a reproducibility decision and belongs to a human.
## Observed, not fixed
Something in the suite writes a real proposal artifact into
teaching/proposals/derived_close_facts/ instead of a tmp_path. The three test
files that name that sink all override it correctly, so the leak is elsewhere —
likely an idle_tick/contemplation path exercising DEFAULT_SINK. Untracked
residue, removed here, flagged for follow-up. Notable because it is only
visible now that the parents[3] bug is fixed and the sink resolves inside the
repo.
[Verification]: gate tier via the new runner — smoke 236, warmed_session 10,
deductive 285, all passed, correctly stamped NON-CANONICAL. Fail-closed path
verified (exit 3 with instructions). lane_sha_verifier 6 passed. Full tests/
tree in progress at 63% with 0 failures at time of commit.
NON-CANONICAL: Python 3.12.11, not the pinned 3.12.13. Not merge evidence.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FduW6Krm3PPQv3P5iwBYtx
Claude