When a debug session resolves, append a structured entry to
.planning/debug/knowledge-base.md capturing error patterns,
root cause, and fix approach.
At the start of each new investigation (Phase 0), the debugger
loads the knowledge base and checks for keyword overlap with
current symptoms. Matches surface as hypothesis candidates to
test first — reducing repeat investigation time for known patterns.
The knowledge base is append-only and project-scoped, so it
builds value over the lifetime of a codebase rather than
resetting each session.
789cac127d