M2: storage layer (all-files + SAF backends, volumes, access policy) + 32 JVM tests

README.md

@@ -12,10 +12,11 @@ no advertising or tracking SDKs.
 
 ## Status
 
-**M1 — pure-Kotlin core: done.** The Android-free `core/` engine (paths, classification,
-sorting, formatting, search, name allocation, transfer planning) is implemented and
-covered by 44 JVM unit tests. See [docs/ROADMAP.md](docs/ROADMAP.md) for the full
-milestone plan.
+**M2 — storage layer: done.** Two backends behind one interface — `AllFilesSource`
+(`java.io.File` under all-files access) and the `SafSource` fallback — plus volume/space
+discovery and the access-mode state machine. Covered by 76 JVM unit tests (32 added
+here), including a Robolectric run of the SAF backend. See
+[docs/ROADMAP.md](docs/ROADMAP.md) for the full milestone plan.
 
 ## Tech stack