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

pyproject.toml

@@ -83,6 +83,7 @@ dev = [
     "black>=23.0.0",
     "ruff>=0.3.0",
     "mypy>=1.8.0",
+    "pydoclint>=0.9.1",
     "build>=1.0.0",
     "twine>=4.0.0",
     "pre-commit>=3.4.0",
@@ -188,6 +189,14 @@ module = [
 ignore_missing_imports = true
 
 
+[tool.pydoclint]
+style = "google"
+exclude = '\.pyi$|tests/'
+allow-init-docstring = true
+skip-checking-raises = true
+check-class-attributes = false
+
+
 [tool.coverage.run]
 source = ["docforge"]
 omit = [