The sanctioned create_issue bootstrap from #749/#750 was unreachable in
production. Two guards assessed the same workspace for the same task and
reached opposite conclusions: the #274 branches-only guard consulted the
bootstrap and permitted a clean canonical control checkout, then the #604
anti-stomp preflight -- which never consulted it -- rejected that same
checkout as wrong_worktree.
The defect was wiring, not policy: the bootstrap decision was computed in
one guard and discarded, while the other re-derived a conflicting answer
from a lower-level assessor with no notion of the bootstrap phase.
Fix: one computation site, one interpretation site.
* create_issue_bootstrap.bootstrap_permits_control_checkout() is the single
predicate both guards use to interpret an assessment. It is fail-closed by
construction: missing, malformed, refused, incomplete, or contradictory
evidence returns False and leaves the ordinary block in force. It also
verifies the assessment describes the exact workspace and canonical root
being guarded, so a stale or foreign assessment cannot be reused.
* _create_issue_bootstrap_assessment() computes the assessment once per
preflight from inspected repository state. verify_preflight_purity threads
that single result into both guards.
* The #604 assessor accepts the assessment and waives ONLY the wrong-worktree
verdict. Root checkout, repo, role, stale runtime, lease, head-SHA,
workflow-hash, and contamination checks are evaluated independently and
still apply.
Evidence is server-derived only and travels an internal path: no MCP tool
signature gains a bootstrap argument, and no caller-controlled boolean can
manufacture eligibility. Behavior is unchanged for callers that supply no
evidence, and for every non-create_issue author mutation.
No issue or PR number is special-cased in production behavior.
Tests: new tests/test_issue_757_bootstrap_guard_agreement.py (38 tests, 26
subtests) covering the shared predicate, the narrow waiver, guard agreement
across the full workspace-state matrix, non-forgeable eligibility, and an
end-to-end native gitea_create_issue run with the #604 gate LIVE. All 38
fail against unfixed sources; the e2e reproduces the production error text
verbatim ("Anti-stomp preflight (#604) blocked mutation [wrong_worktree]").
tests/test_reconciler_close_workspace_guard.py: one case asserted that
create_issue stays blocked on the control checkout, which only held because
the bootstrap-blind #604 guard was overriding #750 -- it encoded the defect.
Re-pointed to lock_issue, which is issue-backed and legitimately still
requires a branches/ worktree. Its teardown now restores the module-level
preflight task/role so test order cannot leak resolved state.
Full suite: 3624 passed, 2 failed, 6 skipped (426 subtests).
Baseline at bde5c5fb on a clean detached worktree: 3586 passed, 2 failed,
6 skipped (400 subtests). The same 2 failures reproduce identically on
pristine master and are unrelated to this change
(test_issue_702_review_findings_f1_f6 F1 worktree recovery;
test_reconciler_supersession_close org/repo forwarding).
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
