Phase 2: Planner Agent GitHub API Integration #632

Summary\n\nThe planner agent is now enabled and generates execution plans for issues and PRs. Phase 2 is to integrate GitHub API calls to:\n1. Post generated plans as comments on issues/PRs\n2. Assign issues to projects based on labels/metadata\n3. Add linking and metadata to generated plan comments\n\n## Problem\n\n- Planner agent generates plans but doesn't post them\n- Issues/PRs not automatically assigned to projects\n- No GitHub API integration to interact with repository\n\n## Solution\n\nImplement GitHub API integration in scripts/agents/planner.agent.js to:\n1. Authenticate with GITHUB_TOKEN\n2. Post generated plan as comment on issue/PR via GitHub API\n3. Add issue to appropriate project based on labels\n4. Add plan comment as hidden metadata for future reference\n5. Handle rate limiting and error cases gracefully\n\n## Implementation Details\n\n- Effort: 3–4 hours\n- Complexity: High\n- Risk: Medium (depends on GitHub API stability)\n- Dependencies: GitHub API (Octokit), label-to-project mapping\n\n## Acceptance Criteria\n\n- [ ] GitHub API integration working with GITHUB_TOKEN\n- [ ] Generated plans posted as comments on issues/PRs\n- [ ] Issues automatically assigned to projects (80%+ accuracy)\n- [ ] Error handling for API rate limits and failures\n- [ ] Fallback queue for ambiguous cases\n- [ ] All tests pass; no regressions\n- [ ] Workflow runs successfully on issue/PR creation\n\n## Related Issues\n\n- #620 (Phase 1: Planner agent implementation - COMPLETED)\n- #618-#623 (Workflow standards audit - COMPLETED)\n\n## Reference\n\nPlanner agent: scripts/agents/planner.agent.js \nPlanner workflow: .github/workflows/planner.yml \nAudit report: .github/reports/audits/workflow-standards-audit-2026-05-31.md",

["area:workflows", "type:enhancement", "priority:high", "meta:needs-changelog"]