Add relay-fleet merge state substrate

[sungjunlee]

Part of #480. Phase 3 Sub-PR A.

Summary

• add non-terminal per-run merge_blocked state and recovery edge back to ready_to_merge
• add fleet-level merging state and self-loop for serialized queue orchestration
• update lifecycle/fleet state tests and architecture/design docs

Out of scope

• actual merge-queue.js serialized orchestration; that remains Sub-PR B

Validation

• node --test tests/relay-dispatch/scripts/manifest/lifecycle.test.js tests/relay-dispatch/scripts/manifest/fleet.test.js tests/relay-fleet/scripts/fleet.test.js
• node --test tests/relay-dispatch/scripts/manifest/*.test.js
• node --test tests/relay-merge/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: 9e9e13c9-554b-4bfb-bc3d-fe58898f6b39

📥 Commits

Reviewing files that changed from the base of the PR and between 9daf40b and d74b9bb.

📒 Files selected for processing (6)

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

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fleet-merge-state

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[sungjunlee]

Local review LGTM.

Reviewed the state substrate diff at d74b9bb. The scope is intentionally limited to lifecycle states and docs; queue orchestration remains for the next PR.

Validation:

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

GitHub Actions test: passing. Codex review body unavailable due usage limit.