Merge branch 'chore/DEN-3956-tmp-temp-ignores' into main (fleet integrate 20260912)

Source: LOCAL chore/DEN-3956-tmp-temp-ignores @ cf298cb, 1 commit(s) not on main.
Merged by the citadel fleet lane; conflicts, if any, are resolved semantically (both sides kept) and noted below.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G7RjB22qc4AaKq4zqeVBVY

Author: ORESoftware

.gitignore

@@ -23,3 +23,7 @@ tmp
 temp
 tmp/worktrees
 temp/worktrees
+
+# Sanctioned scratch locations - AGENTS.md requires both, trailing-slash form
+tmp/
+temp/