Codifies the 2026-09-05 turbo comparison workflow as a project skill under
.agents/skills/: switch BOR_LLM_CHAT_MODEL in .env, run the fixture gate
(twice, for variance) + the locked derived gate with per-turn wall timing,
interpret the two metrics against the reference model rates (re-read habit:
lite ~100%, turbo ~12%; usage-floor MISS as test artifact; caps as real
regression), record the verdicts byte-exact in TOOL_CALLING_TESTING.md, and
commit the doc. Rules baked in: never touch the battery/thresholds/fixtures,
never edit app code, never commit .env.
