Add one-off database inspection and cleanup scripts under
`scripts/scratch/` for local debugging and maintenance work.
Document root cleanliness and file placement expectations for AI
assistants in `GEMINI.md` to keep temporary scripts and tests out of
the project root.
Stop shipping a default Gemini OAuth client secret and require it to
come from the environment instead.
Also tighten proxy fetch typing to avoid any-based undici calls and
move db setup utilities under scripts while removing generated debug
and scratch artifacts.
diegosouzapw