Agent Skills: model-audit

Audit Agent/Task model routing — reads the dispatch log written by the model-routing PreToolUse hook and breaks down spend by model, subagent type, and project. Use when the user asks 'how's the model routing', 'audit my model usage', 'check the dispatch log', 'is the routing hook working', '/model-audit', or before drafting any public-facing post about Claude Code usage. Requires the model-routing hook to be installed first (see hooks/model-routing in this repo).