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/nav/wiki.pyi

@@ -1,3 +1,4 @@
+from collections.abc import Callable
 from pathlib import Path
 from typing import Any
 
@@ -5,11 +6,36 @@ def build_wiki_nav(wiki_dir: Path) -> list[dict[str, Any]]:
     """
     Derive an MkDocs navigation block from a wiki directory.
 
+    Args:
+        wiki_dir (Path):
+            Path to the hand-written wiki directory.
+
     Returns:
-        Wiki navigation entries compatible with the MkDocs
-        `nav` configuration.
+        list[dict[str, Any]]:
+            Wiki navigation entries compatible with the MkDocs `nav`
+            configuration.
 
     Raises:
-        FileNotFoundError: if the wiki directory does not exist
+        FileNotFoundError:
+            If the wiki directory does not exist.
+    """
+    ...
+
+def _render_entries(
+    base_dir: Path,
+    rel: Callable[[Path], str],
+) -> list[dict[str, Any]]:
+    """
+    Render navigation entries for the children of a wiki directory.
+
+    Args:
+        base_dir (Path):
+            Directory whose children are rendered.
+        rel (Callable[[Path], str]):
+            Callable converting a wiki file path into a docs-relative path.
+
+    Returns:
+        list[dict[str, Any]]:
+            Navigation entries for `base_dir` in natural sort order.
     """
     ...