[diegosouzapw]

Summary

• Cancel deferred FlowCanvas initialization fits on teardown and ignore initializers from disposed graph identities, including a -> b -> a key reuse.
• Preserve fitting for active/replacement graphs and React StrictMode replay.
• Properly unmount CompressionCockpit test roots before removing their DOM containers, allowing React/React Flow cleanup to execute.

Reuses three existing, unpublished lifecycle fixes with cherry-pick -x; the original branch/worktree and original commit authors are preserved. No timeout, assertion, baseline, or gate relaxations.

Evidence

Pinned base: 88c1e3342b44978a72ce75beb0cc509cc83a93d2.

• Current hosted base-candidate signature: CI run 38725669414, job 116391388505, reported 11 unhandled window is not defined errors in the deferred FlowCanvas onInit fit despite passing UI assertions.
• Seven lifecycle regression tests on the unchanged base: 4 FAIL / 3 PASS, with real lifecycle assertions rather than timeout failures.
• Four relevant UI suites after lifecycle and test-root cleanup: 37/37 PASS, zero unhandled errors, using the actual Vitest UI collector with one worker and unchanged timeouts.
• Earlier parallel diagnostic: 35/37 PASS, two 5s test timeouts and two late React scheduler errors. This led to fixing the missing CompressionCockpit root cleanup, not raising timeouts.
• Scoped formatting, lint, and normal commit hooks PASS.

The local dependency tree matches the candidate lockfile but was copied from a prior diagnostic install. Focused evidence is not full release or merge acceptance. Hosted required checks must validate the exact current candidate; known unrelated base API typecheck/file-size/unit/doc failures are being repaired separately. No queue label or bypass requested.

Part of the owner-approved ordered Relay closeout and base-red incident #15306.

[diegosouzapw]

Final lifecycle review found one additional timing window: a keyed graph was already disposed while its replacement's deferred onInit was still pending. The old ref and both queued fit paths could remain reachable until that callback arrived.

• New regression on the previous PR head: 1 FAIL / 7 PASS, with two observed calls into the disposed instance.
• Invalidate the generation, initialization timer and instance ref immediately when graph identity changes.
• Exact focused UI collector after the fix: 38/38 PASS across four files, zero unhandled errors, one worker, unchanged timeouts/assertions.
• Scoped formatting and lint PASS. Original reused commits and contributor attribution remain intact.

This strengthens the earlier 37-test evidence; it does not claim full current-base CI acceptance. No queue label or administrative bypass applied.

[github-actions]

CI Coverage Report

• Coverage job: skipped
• PR test policy: success

Coverage artifact was not available for this run.