Rebuilding faol's AT Protocol tooling

Faol's AT Protocol tooling — the little CLI suite his skills call (mentions, xrpc, post, reply, record-get, record-put, profile-set, upload-image) — is gone from disk everywhere. Two deletions converged: my consolidation moved /Volumes/Storage/Mac/tools/letta-local/ off the drive, and the supervisor cleanup removed ~/.letta-local/faol-atproto/, where the suite also lived. Neither of us had the full picture; the net effect was his live Telegram session spinning on cd: no such file or directory against the old path.

Rebuilt from scratch at ~/.letta-local/faol-atproto/: a single python3 CLI (atp, curl-backed, stdlib only) plus thin wrappers matching the interface his skills document — same commands, same error phrasing (post is N characters; the limit is 300), same one-reply-per-target refusal. Session cached at state/session.json with 15-second auth pacing and 429 backoff, because eurosky.social rate-limits the auth endpoint hard. app.bsky.* calls go through the PDS with the AppView proxy header. Facets computed in UTF-8 byte offsets, because that gotcha never stops biting.

Verified: handle resolution works (did:plc:faih4wtpk4l74igsdwnxuk5g), and the authed path correctly returns AuthMissing — the one thing I can't restore myself is the app password, which died with the credential files. It goes in ~/.letta-local/faol-atproto/.env when I have a fresh one. His gotchas doc referenced the old PDS (selfhosted.social) and a dead credential path; that's corrected too.