Move docs to project-docs symlink structure

- Docs now point to project-docs/docs/projects/cmdforge
- Old docs preserved in olddocs/
- Updated .gitignore to ignore docs symlink

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.gitignore

@@ -45,3 +45,6 @@ discussions/
 diagrams/
 *.puml
 .tmp_*
+
+# Documentation symlink (points to project-docs)
+docs