Require committed remote current state

docs/internal/manifest.md

@@ -153,9 +153,8 @@ binds that object by checksum, size, and generation. Readers strictly reject
 unknown fields, version mismatches, pointer/commit identity mismatches, and
 objects that do not match their declaration.
 
-The reader retains a temporary, clearly isolated compatibility path for a
-coherent legacy `current/manifest.json` plus `current/run_id.txt` pair. That
-path is removable after migration and is never used to write new state.
+An absent commit pointer means no remote state is published. Republish to
+establish a current immutable snapshot.
 
 ## Persistence Semantics