Shard Windows Included Files scale gate

[Infiland]

Closes #830

What changed

• Keep the broad native Windows artifact suite but skip only the 10,000-entry Included Files stress test there.
• Add a dedicated Windows 2025 job with the same Python 3.12.10, locked dependencies, and unchanged 20-minute timeout.
• Run the exact scale case through a fail-closed module runner that requires one collected and executed pass and rejects skips, failures, expected outcomes, fixture exits, and non-CI use.
• Lock the dedicated step shape against conditional execution, ignored exits, broader selectors, duplicate invocation, custom shells, and quoted YAML-key bypasses.
• Keep ordinary local and full-suite discovery unchanged and bump release surfaces to 0.7.53.

Why

Exact PR #829 evidence showed the heavy test consumes about 10m46s, the other 613 tests about 8m36s, and setup about 33s. All 614 tests passed, but their combined job crossed the 20-minute cap during teardown. Separate jobs retain native coverage without increasing the timeout.

Validation

• Full Included Files module: 174 tests passed, 13 skipped.
• Exact 10,000-entry case: passed normally and through the required module runner; latest local wrapper run completed one test in 30.979s.
• Runner and workflow-policy adversarial tests cover empty/duplicate collection, skips at fixture and method boundaries, failures/errors, expected outcomes, SystemExit(0), nonzero status propagation, module entrypoint resolution, quoted control keys, ignored exits, broader selectors, and duplicate invocation.
• Complete workflow-policy, runner, and version set: 82 tests passed.
• Coverage-policy, documentation-health, version, and runner set: 32 tests passed.
• Repository-wide Ruff passed.
• Pyright: 0 errors, 0 warnings.
• Three independent adversarial audits found no remaining concrete gate bypass.

The new exact-head native Windows jobs and the clean-environment Linux full suite remain the final acceptance gates.

[Infiland]

Final acceptance evidence for exact head 079e71c65aaa95cb9d6796fc0532849f31c772e2:

• 20/20 check records resolved: 17 successes and the 3 expected pull-request release skips.
• windows-included-files-scale: 12m11s total, leaving 7m49s under the unchanged 20-minute cap. Raw output proves GM2GODOT_REQUIRE_WINDOWS_INCLUDED_FILES_SCALE_GATE=1, the exact case ran once in 689.140s, and Ran 1 test / OK with no skip.
• windows-artifact-transactions: 11m29s total, leaving 8m31s. It ran 616 tests in 651.093s; the exact 10,000-entry case was the intended dedicated-job skip and the suite finished OK (skipped=52).
• Linux full coverage, Windows crash recovery, macOS transactions, both LTS/TCC conversion gates, Ruff, Pyright, dependency locks, and all release builds passed.
• Godot smoke used exact 4.7.1.stable.official.a13da4feb; 83 discovery tests and 60 validation/golden/settings tests passed.

The final pushed diff has independent clean adversarial audits and no remaining concrete gate bypass.