[Launch Child] CI/Test Infrastructure Gate Validation

[ashleyshaw]

Child of #728. Validate CI blockers and pre-existing infra failures are either fixed or explicitly waived with owner sign-off.\n\nTracks: #642 #643 #644 #706

[linear-code]

LS-869

LS-1126

[ashleyshaw]

Validation checkpoint in progress: all currently open v0.5.0-labelled blockers are now closed. Launch-gate review is next in strict order, and this issue will be closed/updated after final launch gate evidence snapshot.

[ashleyshaw]

Launch child gate closed in this pass.

Evidence snapshot:

• CI hard blockers closed: #642, #643, #644.
• Coverage/reliability chain closed: #746, #602, #599, #600, #601.
• Focused test suite: 20/20 passing.
• Focused coverage:
  • planner: 82.20%
  • reviewer: 91.34%
• Required release readiness validations re-run and passing:
  • validate:frontmatter
  • validate:workflows
  • validate:agents
  • validate:skill-manifests
  • validate:plugins
  • npm test

Closing launch child as complete.

[github-actions]

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