fix(gitignore): add /.pr*/ pattern to prevent agent scratch dirs from being committed Refs #2763

PR-reviewer agents create directories like .pr2659/ at the repo root during review runs.
Adding /.pr*/ to .gitignore prevents them from appearing in git status and being accidentally staged.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Test User

.gitignore

@@ -146,6 +146,9 @@ projects/odilo/
 /session-ses_*.md
 /security_audit_report_*.md
 /pr_review_files/
+# Agent scratch directories created at repo root (#2763)
+# Patterns like .pr2659/ are created by PR-reviewer agents.
+/.pr*/
 # Heredoc accidents (bare EOF/PYEOF files created by malformed shell heredocs)
 /EOF
 /PYEOF