856146cced
Adds stderr lines so we can verify the rewrite is actually firing on a given
session ("rewrote N custom tool ref(s) [fn_review_spec×3, ...]") vs. silently
no-opping (no tools, no matches). Helps distinguish "fix not deployed yet"
from "fix not effective" without redeploying instrumentation.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>