just mutants-config/-mcp/-gui, weekly in CI

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GWVo7x3UHw5kwCUaWxiejX

.gitignore

@@ -6,3 +6,6 @@ site/dist/
 /mutants.out*/
 /mutants-store/
 /mutants-import/
+/mutants-config/
+/mutants-mcp/
+/mutants-gui/