chore: remove 269 tracked .claude/ files (3MB) + fix checkpoint merge conflict

- .claude/ is Claude Code IDE artifacts — 269 files, 3MB tracked by git
- These are local workspace files that shouldn't be in version control
- Added .claude/ to .gitignore (was only .claude/settings.local.json)
- Fixed git merge conflict in .pm-checkpoint.json (<<<<<<< Updated upstream)
- Checkpoint normalized with latest autonomy log entries

Co-authored-by: gravl-pm (autonomous agent)

.gitignore

@@ -51,7 +51,7 @@ TODO.md
 ./frontend/.planning/
 ./frontend/tasks/
 ./docs/plans/
-.claude/settings.local.json
+.claude/
 
 # Build output & dist
 dist/