fix(scanner): make distributed usage convergence authoritative (#5151)

* fix(scanner): make distributed usage cycles authoritative

* fix(scanner): close distributed refresh races

* fix(config): align scanner reload integration

* fix(admin): scope config test helpers

* fix(scanner): harden distributed usage convergence

* fix(scanner): preserve rolling activity compatibility

* fix(admin): expose non-secret optional config values

* fix(scanner): acknowledge distributed dirty usage

* fix(ecstore): make bucket mutations cancellation safe

* fix(scanner): preserve pending dirty acknowledgements

* test(obs): account for superseded scanner metric

* fix(api): reject excess detached bucket mutations

* test: close scanner convergence coverage gaps

* fix(scanner): make path tracking cleanup one-shot

---------

Co-authored-by: Henry Guo <marshawcoco@users.noreply.github.com>
Co-authored-by: houseme <housemecn@gmail.com>

crates/e2e_test/src/content_encoding_test.rs

@@ -80,6 +80,25 @@ mod tests {
         assert_eq!(head_resp.content_encoding(), Some("zstd"), "HEAD should return Content-Encoding: zstd");
         assert_eq!(head_resp.content_type(), Some("text/plain"), "HEAD should return correct Content-Type");
 
+        client
+            .delete_object()
+            .bucket(bucket)
+            .key(key)
+            .send()
+            .await
+            .expect("DELETE object failed");
+        client
+            .delete_bucket()
+            .bucket(bucket)
+            .send()
+            .await
+            .expect("DELETE bucket failed");
+        client
+            .list_buckets()
+            .send()
+            .await
+            .expect("RustFS must remain available after deleting a bucket");
+
         env.stop_server();
     }