docs: bring docforge docstrings and wiki to GSDFC standard

- fix GSDFC spec contradictions in __init__ docstring (parenthesized types, fenced-block rule) and sync generated README
- rewrite docstrings across loaders, models, nav, servers, renderers, cli; sync .pyi stubs
- add pydoclint (google style) gate to dev extras and pyproject config
- fix mcp nav resources doc:// -> docs://
- refresh docs/lib and docs/mcp, drop stale docforge/ duplicate group
- update wiki pages and add GSDFC + MCP guides under 05_development

docs/mcp/modules/docforge.renderers.base.json

@@ -23,7 +23,7 @@
         "kind": "class",
         "path": "docforge.renderers.base.Project",
         "signature": "<bound method Alias.signature of Alias('Project', 'docforge.models.Project')>",
-        "docstring": "Representation of a documentation project.\n\nA `Project` serves as the root container for all modules discovered during\nintrospection. Each module is stored by its dotted import path.\n\nAttributes:\n    name (str):\n        Name of the project.\n\n    modules (Dict[str, Module]):\n        Mapping of module paths to `Module` instances.",
+        "docstring": "Representation of a documentation project.\n\nA `Project` serves as the root container for all modules discovered during\nintrospection. Each module is stored by its dotted import path.\n\nAttributes:\n    name (str):\n        Name of the project.\n\n    modules (dict[str, Module]):\n        Mapping of module paths to `Module` instances.",
         "members": {
           "name": {
             "name": "name",