Adds search_babylon_editor_source and get_babylon_editor_source MCP tools
for searching and retrieving Editor source code. Expands source indexing
to include inspector, viewer, addons, accessibility, node-editor, and
procedural-textures packages. Improves pathToDocId to handle Editor paths
and adds Editor URL construction fallback in getDocumentByPath.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
