chore: gitignore local Claude tooling and personal scratch files

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -21,5 +21,14 @@ dist-client/
 .claude/worktrees/
 .claude/settings.local.json
 
+# Local Claude tooling (personal, not shared)
+.claude/commands/
+.claude/skills/
+.claude/workflows/
+CLAUDE-FABLE-5.md
+
+# Personal scratch (planning docs, etc.)
+simon/
+
 # Superpowers brainstorm mockups
 .superpowers/