fix: remind not to version control release notes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: backnotprop

.agents/skills/release/SKILL.md

@@ -106,7 +106,7 @@ The release notes file goes in the repo root as `RELEASE_NOTES_v<VERSION>.md`.
 
 ### Step 4: Present for review
 
-Write the draft to `RELEASE_NOTES_v<VERSION>.md` and tell the user it's ready for review. Wait for their feedback before proceeding to Phase 2.
+Write the draft to `RELEASE_NOTES_v<VERSION>.md` in the repo root and tell the user it's ready for review. Do not `git add` or commit this file — release notes are kept untracked by design. Wait for their feedback before proceeding to Phase 2.
 
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