sqlite: opts + README doc accuracy — the config surface is the watcher cadence + reader pool, durability settings are bootstrapped constants (aligning with review-004 item 9's lib-header correction)

alkstore-sqlite/README.md

@@ -10,11 +10,10 @@ let store = alkstore_sqlite::open("store.db", alkstore_sqlite::SqliteOpts::defau
 
 **Engine posture — single-host, file-backed.** Cross-process on one
 host is verified territory; a `.db` on network storage (NFS
-two-writers) is not a supportable deployment posture. Durability
-knobs, pool sizing, and the watcher cadence are engine-configuration
-concerns on `SqliteOpts` — `synchronous = NORMAL` is hardwired at
-connection bootstrap; there is no consumer surface to raise the sync
-level.
+two-writers) is not a supportable deployment posture. `SqliteOpts`
+carries the watcher cadence and the reader-pool size;
+`synchronous = NORMAL` is hardwired at connection bootstrap — there
+is no consumer surface to raise the sync level.
 
 See the [family README](https://git.alk.dev/alkdev/alkstore/blob/main/README.md)
 for the interface and the deployment matrix, and the