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

docforge/cli/commands.pyi

@@ -1,8 +1,9 @@
 from pathlib import Path
-from typing import Any
 
 from click.core import Group
 
+from docforge.models import DocObject
+
 cli: Group
 
 def build(
@@ -33,4 +34,4 @@ def tree(
     module: str,
     project_name: str | None,
 ) -> None: ...
-def _print_object(obj: Any, indent: str) -> None: ...
+def _print_object(obj: DocObject, indent: str) -> None: ...