chore: update gitignore, remove local AI configs from tracking

- Add .devin/ and .claude/settings.local.json to .gitignore
- Remove .claude/settings.local.json from tracking (local config)
- Delete merged branch copilot/de-ai-framework-prune and its worktree

Author: LessUp

.claude/settings.local.json

@@ -61,3 +61,7 @@ _bmad-output/
 
 # OMC (oh-my-claudecode) local state
 .omc/
+
+# Local AI tool configs
+.devin/
+.claude/settings.local.json