fix: remove broken submodule references

Removes 3 broken submodules causing Gitea 500 errors:
- autonomous-coding
- claude-plugins
- roa2web

These directories are now gitignored as they are separate projects.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.gitignore

@@ -55,3 +55,8 @@ tmp/
 
 # Exclude any other project directories that might be added
 # Keep only workspace-level files (.sh, .md)
+
+# Project directories (separate repos)
+autonomous-coding/
+claude-plugins/
+roa2web/