feat(pds): implement com.atproto.sync.listReposByCollection#178
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Relays use this endpoint to discover which PDSes host repos for a given collection. Cirrus is single-account, so the answer reduces to "does our repo contain any record in the requested collection?". Uses the existing `collections` SQLite cache (with the same lazy backfill as `rpcDescribeRepo`) to answer without walking the MST.
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Summary
com.atproto.sync.listReposByCollection. Relays/crawlers hit this to discover which PDSes host repos for a given collection.rpcHasRecordsInCollectiononAccountDurableObject, backed by the existingcollectionsSQLite cache (with the same lazy backfillrpcDescribeRepoalready uses) so we never walk the MST on a hot path.collection(required, must be a valid NSID viaisNsid) and returns{ repos: [{ did: env.DID }] }when the repo has any record in that collection, or{ repos: [] }otherwise. No cursor — single-account PDS, optional per lexicon.sync.*endpoints; no auth (public per lexicon).@getcirrus/pds).Test plan
test/list-repos-by-collection.test.tscovers: collection with records returns our DID; empty collection returns[]; missingcollectionreturns 400InvalidRequest; invalid NSID returns 400InvalidRequest.pnpm --filter @getcirrus/pds test(296 unit + 84 cli, all passing).pnpm --filter @getcirrus/pds checkclean.