chore(commands): fix ExitWorktree cleanup + ignore worktrees dir

Pass discard_changes: true so cleanup succeeds after branch is pushed.
Add .claude/worktrees/ to .gitignore.

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

.claude/commands/fix-defect.md

@@ -122,5 +122,6 @@ Call `mcp__youtrack__link_issues` for each confirmed link.
 
 ## Step 8 — Cleanup
 
-Call `ExitWorktree` to delete the worktree.
+Call `ExitWorktree` with `discard_changes: true` to delete the worktree.
+(Branch was pushed in step 6 — commits are safe on remote; `discard_changes: true` bypasses the local-ahead guard.)
 Report: branch pushed, ticket commented, links created, worktree deleted, done.

.claude/commands/implement-feature.md

@@ -83,5 +83,6 @@ Files changed:
 
 ## Step 8 — Cleanup
 
-Call `ExitWorktree` to delete the worktree.
+Call `ExitWorktree` with `discard_changes: true` to delete the worktree.
+(Branch was pushed in step 6 — commits are safe on remote; `discard_changes: true` bypasses the local-ahead guard.)
 Report: branch pushed, ticket commented, worktree deleted, done.

.gitignore

@@ -48,3 +48,4 @@ graphify-out/
 .DS_Store
 /jacoco-reporter/.venv/
 /.claude/settings.local.json
+/.claude/worktrees/