Report stalled concurrent occurrence lifecycle stages

[flyingrobots]

The concurrent-occurrence test in #878 timed out without identifying whether runtime opening, lane setup, admission, or cleanup stalled. Report each public lifecycle stage only when the test fails, preserving every existing behavioral assertion and the 60-second limit. This supplies evidence for the next occurrence. The root cause tracked in #878 remains unresolved and blocks release #876.

Change kind: test diagnostics, plus the development-only @humanfs/node security update required by the locked release audit (GHSA-p498-v437-472g, also prepared in #877).

Validation: an injected stalled close was observed red and named close writer-b: pending while retaining completed opening and admission stages. The ordinary five-test file, normal pre-push gates, locked audit, and exact-head Node 22 CI all passed. Manual SSJS review is green; diagnostic state is test-owned and adds no production host dependency or cast.

The original timeout remains unreproduced. Disposable Linux arm64 probes on Node 22.23.2/Git 2.55.0 covered the baseline, five idle-retirement schedules, 24 payload cases, and one-shot failures of four Git protocols. These bounded probes passed or rejected with completed cleanup. They are not an exhaustive schedule search or an identical reproduction of the Ubuntu 24.04 x64 runner.

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• test/integration/application/Runtime.entityOccurrence.integration.test.ts

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[github-actions]

Release Preflight

• package version: 19.1.0
• prerelease: false
• npm dist-tag on release: latest
• npm package payload: passed
• jsr publish dry-run: passed

If this PR is from a release/* branch and merges to main, Main Push Release Branch Check will run final preflight and create v19.1.0. A maintainer who is a JSR @git-stunts scope member must then dispatch the Release workflow manually.