fix: ignore entire .claude/ directory, not just settings

The .claude/skills/ directories are created by Claude Code when agents
add skills (ghi-list, pr-list, handoff). These should not be tracked.

Fixes: gt-q0jy15.2

.gitignore

@@ -24,8 +24,8 @@ pkg/
 *.swo
 *~
 
-# Claude Code
-.claude/settings.local.json
+# Claude Code local state (skills, settings, etc.)
+.claude/
 
 # OS
 .DS_Store