Add a conversational AI interview flow to the missions screen that
interviews users to break down missions into milestones, slices, and
features with verification criteria at every level.
Backend: Replace stubbed interview logic with real AI agent integration
using createKbAgent, SSE streaming, and robust JSON parsing. Wire up
all 5 placeholder mission interview route endpoints (start, respond,
cancel, stream, create-mission).
Frontend: New MissionInterviewModal component with conversational UI,
thinking output display, question renderers, and hierarchical plan
review/edit. Integrated into MissionManager with "Plan with AI" button.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
