An adversarial review of the feature found two blocking defects (both would
surface the moment external_pr_enabled is turned on) plus hardening gaps:
- HIGH: the enforcement legacy role-gate overlay OVERWROTE spec-derived roles,
so pr_reviewer was erased from the (in_progress->completed) edge it shares
with the PM self-complete gate — the review task could never complete. Fix:
UNION legacy + spec roles instead of overwriting (also preserves the legacy
'add roles' intent on every shared edge).
- HIGH: claim_pr_review routed claim+start through the verb runner, which hit
start()'s plan gate (planless review task -> None -> crash/respawn loop) and
auto-created+pushed a stray branch (violating the read-only/branchless
invariant). Fix: mirror QA's claim_review — a verb-body TaskService.pr_review_claim
does pending->in_progress with no plan and no branch.
- MED: add the pr_reviewer Write(*)/Edit(*) deny at the permission layer (it
ingests untrusted PR diffs — make read-only explicit, not implicit).
- MED: regenerate the verb-table artifacts (the schemas existed but the
generator had not been re-run; the agent prompt showed 'unknown' signatures).
ruff + mypy clean (279 files); foundation + gateway suites green (5205 passed).