govlink

Scaffold a new govlink backend dataset plugin (source.py, parser.py, model.py, dataset.py + tests + Alembic migration). Use when the user asks to "add a dataset", "register a new dataset", "scaffold a govlink dataset plugin", or names a new publisher/source for ingestion.

Port one HTML mock from frontend/docs/html/ into a real React route on feat/frontend-public, wire it to live backend endpoints, and tick the corresponding row in frontend/docs/pages-tracker.md. Use when the user asks to "build the X page", "implement the reports page", "port the developer page", or otherwise points at one of the 🟢 (or newly-unblocked) entries in the pages tracker.