GRAVITAS — Performance Extension

Performance analysis mode. Load in addition to skills/gravitas/SKILL.md. All perf claims require measured before/after numbers. No guessing.

Core Rule: Measure Before Optimizing

Never optimize without a baseline measurement. "This is slow" is not a baseline.

Baseline required:
  - What is the current latency/throughput? (measured, not estimated)
  - What is the target? (user's goal or SLA)
  - What is the profiler saying is hot? (not intuition)