Windsurf rules

1---
2name: diagnose-root
3model: sonnet
4description: "Run 4-phase root cause analysis — reproduce, isolate, hypothesize, verify. Use when a bug is confirmed but root cause is unclear, after investigate-bug, or when user mentions root cause analysis."
5---
6 
7# Diagnose Root
8 
9**Boundary**: Canonical, reusable 4-phase RCA engine. Invoked by `investigate-bug` (as step 2 of the end-to-end flow) and by `fix-bug` (when no bug file exists). Does not write the bug file — that is `investigate-bug`'s responsibility.
10 
11Four phases — do not skip. Update the active `specs/bugs/BUG-*.md` file at each phase.
12 
13## Phases
14 
151. **Reproduce** — minimal steps; record environment; capture logs.
162. **Isolate** — narrow to module/function; binary-search commits or config.
173. **Hypothesize** — list ranked hypotheses with falsification test each.
184. **Verify** — run falsification; confirm single root cause; link to fix plan.
19 
20> **HARD GATE** — Do not propose a fix until phase 4 confirms one root cause with evidence.
21 
22## Verify
23 
24→ verify: `[ "$(grep -lE 'Reproduce' specs/bugs/BUG-*.md 2>/dev/null | grep -cv "\.okf\.md$")" -ge 1 ]`
25