Canadian cities labeler over Bluesky DMs

Users DM @cities.pds.cosocial.ca their city and get a signed account label.
Serves com.atproto.label.queryLabels and subscribeLabels, built on jacquard.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

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+# cosocial cities labeler
+
+An atproto labeler that puts a Canadian city badge on accounts that ask for one over Bluesky DMs.
+
+1. Subscribe to `@cities.pds.cosocial.ca` (the Subscribe button on its profile).
+2. Follow it.
+3. DM it your city, e.g. `Halifax` or `Richmond, BC`. Send `remove` to clear it.
+
+The labeler polls its DMs, matches the city against `data/cities.json`, and signs an account
+label (e.g. `halifax-ns`), negating any previous one. Labels are stored in SQLite and served over
+`com.atproto.label.subscribeLabels` and `queryLabels`.
+
+```
+src/
+  dms.rs       DM polling, onboarding, replies
+  cities.rs    city list and matching
+  labeler.rs   set_city: negate the old label, apply the new one
+  labels.rs    label signing
+  server.rs    queryLabels + subscribeLabels (axum, jacquard-axum)
+  db.rs        SQLite
+  bin/keygen.rs
+```
+
+Built on [jacquard](https://tangled.org/nonbinary.computer/jacquard) for atproto types and XRPC.
+
+## Local test
+
+```sh
+cp .env.example .env      # set LABELER_APP_PASSWORD
+cargo run --bin keygen    # paste SIGNING_KEY_HEX into .env
+cargo run                 # :4100
+```
+
+`rust-toolchain.toml` pins the Rust version; rustup installs it on first build.
+
+The labeler account must allow DMs from everyone (Settings → Privacy and security → Chat).
+DM it from a test account, then check
+`curl 'localhost:4100/xrpc/com.atproto.label.queryLabels?uriPatterns=<did>'`.
+
+Labels won't appear in the Bluesky app until the labeler is deployed publicly and its DID
+document has the `#atproto_label` key and `#atproto_labeler` service.