chore(tools): regenerate stale tool metadata

`bun run tool-metadata:check` fails on origin/staging as well as here, so this
is not from this branch — #6317 landed the artifact generated from a factory
that still built a per-provider apiKey description, and the source was later
genericized without regenerating.

Regenerating changes exactly the five embeddings entries' apiKey description to
the text `tools/embeddings/factory.ts:74` actually produces. The per-provider
strings appear nowhere in source. Included here only because the gate is red on
every branch cut from staging until someone lands it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: icecrasher321