feat: build each doc kind with its own MkDocs config and site

docs/wiki/01_overview.md

@@ -2,7 +2,7 @@
 
 `docforge` turns GSDFC-compliant Python docstrings into maintainable reference
 documentation. It never edits source docstrings; it reads them, renders them,
-and assembles a single MkDocs site from all available material.
+and assembles documentation sites from all available material.
 
 ## What it generates
 
@@ -13,16 +13,17 @@ and assembles a single MkDocs site from all available material.
 | `wiki`    | Hand-written markdown      | `docs/wiki/**` (unchanged)      |
 | `mcp`     | GSDFC docstrings + renderers | `docs/mcp/**` structured JSON |
 
-## Combined build
+## Per-kind MkDocs builds
 
-One `mkdocs.yml` and one MkDocs build serve all kinds:
+Each enabled site kind produces its own MkDocs configuration and build:
 
-1. Wiki navigation is derived from the `docs/wiki/` file structure.
-2. Generated library/API navigation is appended after it.
-3. The wiki `index.md` becomes the site `Home`.
+1. `--mkdocs` (lib) writes `docs/mkdocs.lib.yml` and builds `site/lib/`.
+2. `--api` writes `docs/mkdocs.api.yml` and builds `site/api/`.
+3. `--wiki` writes `docs/mkdocs.wiki.yml` and builds `site/wiki/`.
 
-Hand-written wiki content is never overwritten or regenerated — only its
-navigation is derived automatically.
+Every site is self-contained (own theme assets and search index) with
+navigation derived or scoped to that kind. Hand-written wiki content is never
+overwritten or regenerated — only its navigation is derived automatically.
 
 ## MCP bundle