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Overview / Motivation

Auto-filed by the watcher urgent-park router (#1681, autonomous_session_watch.urgent_wf_park_pass) from an URGENT (urgency: main-red) parked workflow-fix candidate raised on task #1911. The named test is red on origin/main NOW — every intervening session's Step 9c gate re-classifies it until this fix lands.

Goal

fix tests/test_issue1689_os_exit_shutdown_bypass.py::test_entrypoint_calls_os_exit[issue1689_fits_mirror.py] red on origin/main: Convert the main guard of scripts/issue1689_fits_mirror.py to the pinned flush-then-os._exit form (rc type-coerced), matching the 34adf410e9 fix applied to the user_slot entrypoints.

Workflow gap

Bug observed (emitter's claim, candidate block): scripts/issue1689_fits_mirror.py (landed on main at 8c9140aa0a) ends with sys.exit(main()) where tests/test_issue1689_os_exit_shutdown_bypass.py pins the canonical flush-then-os._exit entrypoint form — 3 parametrized test nodes for [issue1689_fits_mirror.py] are currently red on origin/main (confirmed by the #1911 implementer's local run 2026-07-31; file byte-identical to origin/main). The sibling user_slot entrypoints were already conformed by issue-1903 (34adf410e9, "fix red main"); fits_mirror was missed.
Failing node (router-verified): tests/test_issue1689_os_exit_shutdown_bypass.py::test_entrypoint_calls_os_exit[issue1689_fits_mirror.py]
Confidence (emitter): high
verified-at-filing: uv run pytest tests/test_issue1689_os_exit_shutdown_bypass.py::test_entrypoint_calls_os_exit[issue1689_fits_mirror.py] -q -> rc=1 at main @ 9365e2f74b (2026-08-01T01:03:41Z) (FAILED — red confirmed)

Proposed change (candidate diff sketch — refine in planning)

(see the verbatim candidate block under ## Provenance — the router forwards it unmodified and never synthesizes fields)

Scope / surfaces

Primary target: scripts/issue1689_fits_mirror.py
Failing node: tests/test_issue1689_os_exit_shutdown_bypass.py::test_entrypoint_calls_os_exit[issue1689_fits_mirror.py]

Constraints / invariants

NON-workflow-surface fix (wf_fix: false declared by the parking session — the /daily route-2 analogue); scope stays on the named target, never tasks/ state.

Provenance

fingerprint: 9b7296e983b8
routed-by: autonomous_session_watch urgent-wf-park-router (#1681)

target_file: scripts/issue1689_fits_mirror.py bug_observed: scripts/issue1689_fits_mirror.py (landed on main at 8c9140aa0a) ends with sys.exit(main()) where tests/test_issue1689_os_exit_shutdown_bypass.py pins the canonical flush-then-os._exit entrypoint form — 3 parametrized test nodes for [issue1689_fits_mirror.py] are currently red on origin/main (confirmed by the #1911 implementer's local run 2026-07-31; file byte-identical to origin/main). The sibling user_slot entrypoints were already conformed by issue-1903 (34adf410e9, "fix red main"); fits_mirror was missed. why_workflow_gap: Pre-existing red in the pinned os._exit contract tests makes every session's Step 9c gate re-classify the same failure (the #1681 fleet-wide per-hour cost class). proposed_change: Convert the main guard of scripts/issue1689_fits_mirror.py to the pinned flush-then-os._exit form (rc type-coerced), matching the 34adf410e9 fix applied to the user_slot entrypoints. diff_sketch: | main guard: capture rc = main(); flush stdout/stderr; os._exit(rc if isinstance(rc, int) else 0) — the exact shape 34adf410e9 applied to the sibling scripts. confidence: high related_task: #1911 urgency: main-red failing_test: tests/test_issue1689_os_exit_shutdown_bypass.py::test_entrypoint_calls_os_exit[issue1689_fits_mirror.py] wf_fix: false