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/lib/docforge/index.md

@@ -1,9 +0,0 @@
-# Docforge
-
-::: docforge
-- [Cli](cli/)
-- [Loaders](loaders/)
-- [Models](models/)
-- [Nav](nav/)
-- [Renderers](renderers/)
-- [Servers](servers/)