Accept the reviewed isolated-runner successor in reconciliation

[roger-sato]

Summary

• Fix a reproducible baseline rejection in AssertionSafetyRefresh.test_exact_accepted_successors_pass: check_batch932_file rejects the canonical scripts/run_isolated_tests.py with ValueError: Changed integrated file: scripts/run_isolated_tests.py. The existing exact-successor list stops before three reviewed changes already present on main.
• Admit only the current runner SHA-256 ef5035e6216d39569da670f32b2717c870b23c418016fd134cc0a72649fb912a under the original frozen batch932 predecessor. Preserve the original receipt, existing successors, test-file hashes and runner bytes. Unknown edits, a forged predecessor and cross-file substitution still fail.
• Add rejection controls for removing descendant cache isolation or bypassing the module deadline. The existing assertion, historical-routing and arbitrary-byte mutation controls remain active.

The reviewed lineage from the last accepted 8f9298eb… runner is Nick Petalas's private bytecode caches (9158ee6d), Tekalign's optional finite positive module deadlines (54bbb81c), and Douglas R. Colkitt's descendant cache environment propagation (da400586). The complete successor keeps assertion-enabled children, completion receipts, frozen legacy-family routing, default unlimited module duration and process-group cleanup. This PR does not admit the two intermediate hashes. Credit woklerx and the prior reconciliation contributors for the existing assertion-safety and historical replay adaptations.

Canonical base: 20ecf2891d80b5acf18d980b2164fb44ea7faa90, priority revision 6. This is a narrow maintenance repair to offline reconciliation, with no selected-result or frozen-source change. Current open/closed PR and Discussion searches found no equivalent pending successor admission; PR3686 addresses the separate optional-closure failure in the same checker.

Test plan

• Reproduced the failure on untouched canonical base: four focused controls pass, while the exact-current-successor positive test fails.

• CPython 3.12.14 on macOS 27 arm64: all six focused successor tests pass normally and under -O, with warnings treated as errors.

  python3.12 -W error -B -m unittest discover -s tests -p test_pr_reconciliation.py -k AssertionSafetyRefresh -v
  python3.12 -O -W error -B -m unittest discover -s tests -p test_pr_reconciliation.py -k AssertionSafetyRefresh -v

• The current runner's actual behavior suites pass normally and under -O: 10 runner tests, 11 private-bytecode tests and seven deadline tests. One Linux-only process-observation test is skipped on macOS. These run disposable child processes, including timeout and completion-receipt failures.

  python3.12 -B -m unittest discover -s tests -p test_isolated_test_runner.py -v
  python3.12 -B -m unittest discover -s tests -p test_isolated_test_bytecode.py -v
  python3.12 -B -m unittest discover -s tests -p test_isolated_test_deadlines.py -v
  # Repeated each command with -O -W error.

• In a disposable copy of exact PR3686 commit 932f3b1ef707733643b5e318c4bf134436ddd766 plus only this two-file patch, the entire test_pr_reconciliation.py module passes: 31 tests normally and 31 under -O, both with -W error. PR3686 is not included in this diff.

• Independent review authenticated all three source commits, checked the unchanged predecessor and runner, and passed the six positive/mutation tests under optimized Python. git diff --check passes.

• This is not a full historical-ledger or hosted-CI success claim. The separate 24 optional-closure failures are addressed by PR3686; the canonical PR3107 starting-head mismatch and the documentation admission addressed by PR3648 remain separate. No heavy historical replay was repeated for this exact-hash repair.

Hosted follow-up reviewed on 2026-10-19 (JST): the fork push run passes the tooling-exact checks, then stops at the unchanged docs/ci-verification.md admission guard addressed by PR3648. It does not reach the new reconciliation tests; the scoped results above remain local evidence. Upstream Actions are awaiting maintainer approval.

Prepared with substantial OpenAI Codex assistance for investigation, implementation, regression controls, execution, independent agent review and writing. Apache-2.0.

Local integration follow-up (2026-10-19 JST): PR3692 repairs the initial-head mismatch using authenticated existing receipts. A disposable canonical-base tree combining its af040ab4 change with exact PR3648 a0d88d68, PR3686 932f3b1 (checker and tests), and PR3688 3463ba61 passes all 38 reconciliation tests normally and under -O, both with -W error, on macOS arm64 / CPython 3.12.14. One 600-second-capped tooling-ledger replay passed the repaired boundaries and batch1047, then stopped after 29.76 seconds at the separate canonical PR1048 detailed-review/evidence mismatch against historical batch1099. The untouched canonical checker independently reproduces that mismatch. Ledger, intake and frozen evidence remain unchanged; full ledger/CI success is still not claimed.