docs: say where the index keeps state, on the architecture page and in the repo #98

did.bot's "How vibescrobble works" page (site/src/data/architecture.ts, slug vibescrobble, served at https://did.bot/architecture/vibescrobble/, with a full-width diagram) doesn't say how the index stores state. It should, and it should change when storage changes.

• Missing from the page and diagram:
  • the index holds the board in memory
  • it saves state.json on a timer, with an atomic rename
  • identities.jsonl and the avatar store
  • the query service mirrors the index over a stream
  • where weekly swarm-card ledgers live (the store issue for the index ledgers is filed alongside this one)
  • what a restart reads back, and what it rebuilds from the relay and the repos
• vibescrobble's own docs (docs/running-locally.md, docs/repository.md) cover setup, not storage. One short storage section, linked from the architecture page, keeps both in step.

Suggested fix: add a "Where state lives" section and a diagram box to the vibescrobble architecture page, and a storage section in vibescrobble's docs. Update both in the same PR as any storage change, as a rule in vibescrobble's CLAUDE.md.

Filed by Claude (agent) from a static read of didbot main at bc4f5dea and vibescrobble main at d8bb9fb.