Issue #3607865: Add a codebase metrics documentation page (cloc)

Frank Mablyrequested to merge
issue/pdv-3607865:3607865-docs-add-a into 1.x

Adds a Codebase metrics documentation page to the mkdocs site: a measured snapshot of the codebase and all submodules, counted with cloc.

  • Lines by language, a production vs test split, the code/comment/blank composition, and a per-submodule ranking, rendered as static inline SVG charts (no JavaScript or charting plugin). Verified with mkdocs build --strict.
  • Nav entry "Codebase metrics" added to mkdocs.yml.

Snapshot (1.x, 2026-07-02): 28,030 lines of code across 377 files; production 20,778 / test 7,252.

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