Add typed crsql changes extraction

docs/architecture.md

@@ -96,8 +96,10 @@ and file sync trees are future work.
 `geth-db` currently registers local SQLite paths as DB resources and reports
 local-only sync status plus a read-only SQLite schema summary/hash. It also
 inspects `crsql_changes` metadata when that table or view exists, reporting
-change count, columns, and max `db_version`. Loading cr-sqlite, extracting
-change batches, applying changes, and DB sync are future work.
+change count, columns, and max `db_version`. The crate can extract read-only
+typed change batches from `crsql_changes` with schema metadata for future sync
+messages. Loading cr-sqlite, applying remote changes, and DB sync are future
+work.
 
 `geth-kv` currently provides a SQLite-backed local fallback for named KV stores
 through `kv create/set/get`. Iroh Documents namespaces, prefix authorization

docs/roadmap.md

@@ -312,8 +312,10 @@ Automerge documents.
   - `[x]` DB status reports `crsql_changes` row count, columns, and max
     `db_version` when available.
   - `[x]` Tests use a temp SQLite DB and deterministic fixture changes.
-  - `[ ]` The module can extract typed change batches from `crsql_changes`.
-  - `[ ]` Schema hash/version metadata is included in sync batches.
+  - `[x]` The module can extract typed change batches from `crsql_changes`.
+  - `[x]` Schema hash/version metadata is included in extracted change batches.
+  - `[ ]` Extracted batches are exposed through a daemon control command or sync
+    protocol.
 
 - `[ ]` DB sync over Iroh.
   Acceptance criteria: