chore: ignore CLAUDE.local.md (#3966)

Root-level local Claude overrides are not covered by .claude/*.local.*
(prefix-scoped to .claude/). Peer to AGENTS.override.md under # AI —
unanchored so any-depth CLAUDE.local.md stays out of commits.

Functions#60 (recovered from local vvlnsmoy)

Author: lkingland

.gitignore

@@ -37,6 +37,7 @@ __pycache__
 
 # AI
 AGENTS.override.md
+CLAUDE.local.md
 .claude/*.local.*
 .claude/pr/*
 .claude/plans/*