feat: enhance storage stats and cluster health reporting

- Introduced new data structures for bucket and storage statistics, including BucketSummary, StorageStats, and ClusterHealth.
- Implemented runtime statistics tracking for buckets, including object count and total size.
- Added methods to retrieve storage stats and bucket summaries in the FileStore.
- Enhanced the SmartStorage interface to expose storage stats and cluster health.
- Implemented tests for runtime stats, cluster health, and credential management.
- Added support for runtime-managed credentials with atomic replacement.
- Improved filesystem usage reporting for storage locations.

changelog.md

@@ -1,5 +1,29 @@
 # Changelog
 
+## Next - feat(credentials)
+add runtime credential management APIs
+
+- Expose `listCredentials()` and `replaceCredentials()` through the Rust bridge and the `SmartStorage` TypeScript API.
+- Move request authentication onto a native runtime credential store so credential replacement is atomic and effective for new requests immediately without a restart.
+- Validate replacement input cleanly by rejecting empty replacement sets, empty credential fields, and duplicate `accessKeyId` values.
+- Add runtime credential rotation tests covering initial auth, revocation of old credentials, multiple active credentials, and invalid replacements.
+
+## Next - feat(cluster-health)
+add runtime cluster and drive health introspection
+
+- Expose `getClusterHealth()` through the Rust bridge and the `SmartStorage` TypeScript API.
+- Report native cluster mode state including local node id, peer status, local drive probe health, quorum health, erasure settings, and tracked healing runtime state.
+- Return a clear `{ enabled: false }` response when clustering is not active instead of synthesizing config-based data.
+- Add standalone and single-node cluster tests plus README documentation for the best-effort semantics of peer and repair health values.
+
+## Next - feat(stats)
+add runtime bucket summaries and storage stats
+
+- Expose `getStorageStats()` and `listBucketSummaries()` through the Rust bridge and the `SmartStorage` TypeScript API.
+- Maintain native runtime stats for bucket counts, object counts, and logical stored bytes, initialized from on-disk state at startup and updated on bucket/object mutations.
+- Include cheap filesystem-capacity snapshots for the storage directory or configured cluster drive paths.
+- Add AWS SDK integration coverage for object add, delete, and bucket delete stats flows and document the cache consistency semantics in the README.
+
 ## 2026-03-23 - 6.3.2 - fix(docs)
 update license ownership and correct README license file reference