- Migrate mission, milestone-slice, and subtask breakdown flows to shared ai-session-diagnostics logging
- Add a planning-flow guardrail test that fails on raw console.* diagnostics across planning modules
- Update mission and subtask breakdown tests to use structured diagnostics sink hooks instead of console spies
- Keep backward-compatible diagnostics test hooks and reset injected sinks to avoid cross-test leakage
- Rename engine export and call sites to use createFnAgent consistently across runtime flows
- Update core lazy engine loader and dashboard agent-generation/planning/chat paths to reference createFnAgent
- Refresh affected unit and integration tests, including renaming pi-create-kb-agent.test.ts to pi-create-fn-agent.test.ts
- Update AGENTS.md documentation references to match the new createFnAgent name
- Add parseTargetInterviewResponse function to extract structured data from milestone/slice interview responses
- Parses target descriptions, sizing, priorities, and dependencies from AI interview output
- Handles malformed JSON gracefully with error fallbacks
