Anchor Pi dispatch dogfood to clean base

[sungjunlee]

Closes #619

Summary

• anchor live dispatch canaries in a temporary clean worktree from --dispatch-base-ref (default origin/main)
• report dispatch base repo/ref in dogfood JSON so PR-boundary evidence is auditable
• document the clean-base behavior and test cleanup on preflight failure

Live evidence

• RELAY_HOME=$(mktemp -d) node skills/relay-dispatch/scripts/live-dogfood.js --repo . --scenario pi-dispatch-canary --dispatch-timeout 180 --command-timeout-ms 300000 --json --markdown
  • pi-dispatch-canary -> pass
  • dispatch base: origin/main
  • run reached review_pending with PR relay live dogfood dispatch canary pi 1780233205022 #667 and prCreatedByUs: true
  • evidence PR relay live dogfood dispatch canary pi 1780233205022 #667 was closed afterward because the generated canary file is not intended to land

Validation

• node --test tests/relay-dispatch/scripts/live-dogfood.test.js tests/relay-dispatch/scripts/docs-defaults.test.js
• node --test tests/skills-lint/scripts/*.test.js
• node --test tests/relay-dispatch/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: 60d77ba2-d766-46db-bc46-8a6b21c65420

📥 Commits

Reviewing files that changed from the base of the PR and between 47baabf and f9db5ec.

📒 Files selected for processing (3)

• docs/relay-operator-guide.md
• skills/relay-dispatch/scripts/live-dogfood.js
• tests/relay-dispatch/scripts/live-dogfood.test.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/pi-dispatch-clean-base

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[sungjunlee]

Local review: LGTM. I reviewed the clean-base worktree anchoring, cleanup paths, command construction, docs, and tests. CI is green; Codex review and CodeRabbit both only reported usage/rate limits. Local validation passed: node --test tests/relay-dispatch/scripts/live-dogfood.test.js tests/relay-dispatch/scripts/docs-defaults.test.js; node --test tests/skills-lint/scripts/.test.js; node --test tests/relay-dispatch/scripts/.test.js; git diff --check. Live Pi dispatch evidence: pi-dispatch-canary passed from origin/main base and reached review_pending with PR #667 before the evidence PR was closed.