Adapters

src/adapters/browser/index.ts — createBlobSink, createMemorySink, createBrowserAssetResolver.

src/adapters/backend/index.ts — createFileSink(path), createBufferSink.

src/adapters/postgres-contract/index.ts — DocumentRepository (create/get/update with optimistic concurrency, listRevisions/restore, listDocuments keyset, getIdempotency), createInMemoryRepository ref, migrations/001_init.sql.

src/adapters/s3-compatible/index.ts — S3Config, UploadIntent, createPresignedUrl (SigV4 HMAC), createFakeS3Adapter, createS3Adapter.

See examples/postgres.mjs, examples/s3.mjs.