Add relay-fleet review single-pass mode

[sungjunlee]

Part of #479.

Summary

• add the fleet reviewing state and dispatch -> reviewing transitions
• add relay-fleet --review to run one foreground review-runner.js pass per review_pending child
• skip terminal child states and fail closed when a child review exits without manifest progress
• document the Phase 2 Sub-PR A boundary; redispatch loop/resume extensions remain deferred

Validation

• node --test tests/relay-fleet/scripts/*.test.js
• node --test tests/relay-dispatch/scripts/manifest/fleet.test.js
• node --test tests/relay-dispatch/scripts/*.test.js
• node --test tests/skills-lint/scripts/*.test.js
• git diff --check

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: d270b398-f669-4440-8120-c08a4021d3d6

📥 Commits

Reviewing files that changed from the base of the PR and between 23235db and 58b2c5b.

📒 Files selected for processing (6)

• skills/relay-dispatch/scripts/manifest/fleet.js
• skills/relay-fleet/SKILL.md
• skills/relay-fleet/references/design.md
• skills/relay-fleet/scripts/relay-fleet.js
• tests/relay-fleet/scripts/fleet.test.js
• tests/relay-fleet/scripts/relay-fleet.test.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fleet-review-single-pass

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[sungjunlee]

Local review LGTM.

Reviewed the Sub-PR A diff after the CI run and fixed one self-review finding before merge: relay-fleet --review now treats child manifest state transitions as review progress, not only round/verdict changes.

Validation on head 58b2c5b:

• node --test tests/relay-fleet/scripts/*.test.js
• node --test tests/relay-dispatch/scripts/*.test.js
• node --test tests/skills-lint/scripts/*.test.js
• git diff --check

GitHub Actions test: passing.