fix

Comprehensive finding fixer. Use when asked to "fix these findings", "fix the review", "address the issues", or after running /pr-review, /plan-review, or /bug-investigation and wanting to act on the findings. Reads findings from the current session context, investigates each finding via background agents, and implements all fixes with the lead. Auto-detects fix target (plan file, code, bugs). For plan-review Research Gaps and Unknown Unknowns, runs actual spikes and verification — executes the research, not just documents it.