claude up some atproto stuff

add mental model distillation to atproto orientation skill

brief paragraph covering repos, DIDs, handles, collections, lexicons,
PDS, relays, AppViews, and portable identity. links to atproto.com's
understanding-atproto page for deeper grounding via WebFetch.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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skills/atproto/SKILL.md
··· 6 6 7 7 # atproto — building on the AT Protocol 8 8 9 - **Learn the fundamentals:** https://atproto.com — covers DIDs, AT-URIs, lexicons, PDS, and the data model. 9 + ## the mental model 10 + 11 + Users own **repositories** of JSON records, identified by a permanent **DID** and a human-readable **handle** (a DNS name). Records are organized into **collections** defined by **lexicon** schemas (e.g. `app.bsky.feed.post`). A user's **PDS** (Personal Data Server) hosts their repo, handles auth, and syncs changes to **relays**, which produce a firehose of events. **AppViews** consume that firehose to build products — feeds, search, notifications. Identity is location-independent: a DID resolves to the current PDS, so users can migrate without losing their data or social graph. 12 + 13 + For deeper grounding: https://atproto.com/guides/understanding-atproto 10 14 11 15 ## what's available to you 12 16