The toolchain guard fails open on a recorded 'unknown' status (precision over recall — never strand a task on an inconclusive smoke). But an 'unknown' means provisioning ran yet the smoke could not confirm the suite is collectable under the interpreter, so the gate was proceeding blind with no trace — a silent hollow pass. It now emits a 'toolchain.unverified_gate_pass' warning with the agent and task ids when proceeding past 'unknown', while still not blocking; a missing marker (None) stays silent so the warning carries signal.
make quality runs mypy over tests/ too; the toolchain test fixtures
(monkeypatch params, the fake-subprocess factories) were missing annotations.
No behavior change.
Adds _toolchain_broken_guard: when toolchain matching is on and the acting
agent's workspace recorded a 'broken' status (the project's suite cannot be
collected under the provisioned interpreter), i_am_done, pass_review, and
pr_pass refuse with an i_am_blocked remediation instead of letting the role
"pass" on a source read. fail_review / pr_fail stay available. git gains
toolchain_status_for_task (resolves the actor's workspace, reads the marker,
fail-open None). Inert when the flag is off; a missing/unknown status never
strands a task.
Renn F