commit pi sessions

pi/.pi/agent/prompts/p-debug.md

@@ -0,0 +1,16 @@
+---
+description: Diagnose a failing test, build, or runtime error
+argument-hint: "[error message, test name, or stack trace]"
+subagent: true
+fork: true
+---
+Diagnose the following failure: $@
+
+Structure your answer as:
+1. **What failed** — one-sentence summary; quote the exact error line
+2. **Likely root cause** — ranked list, most probable first
+3. **Minimal fix** — the smallest change that would resolve it
+4. **How to verify** — the exact command or test to confirm the fix
+5. **How to prevent** — a regression test, invariant, or guard to add
+
+Be specific. If multiple causes are plausible, name each and give a quick disambiguation check (a log line, a flag, a one-line probe) to tell them apart. Do not speculate beyond what the error message and the code actually show — if you need more data, say so explicitly.