build(gitignore): clean up and add .claude settings

- Remove duplicate entries for .claude directories
- Remove obsolete script/tracker files
- Add .claude/settings.local.json
- Normalize whitespace

Author: potatoqualitee

.gitignore

@@ -57,15 +57,12 @@ allcommands.ps1
 /.aitools/.aitools/.aider
 /.aitools
 .aider*
-/.shadowgit.git
-/.claude
-publish.ps1
+/.shadowgit.git
+publish.ps1
 
 PR_BODY.md
 
 PR_DESCRIPTION.md
-nul
-docs/trackers/features/commit-bug-review-TRACKER.md
-scripts/commit-bug-review-prompt.md
-scripts/commit-bug-review.ps1
-docs/trackers/features/commit-bug-review-TRACKER.md
+nul
+.claude/settings.local.json
+/scripts