semi implemented and features implemented save checkpoint

docs/features/unchecked/cli/feed-snapshotting-for-deterministic-replay.md

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+# Feed Snapshotting for Deterministic Replay
+
+## Module
+Cli
+
+## Status
+IMPLEMENTED
+
+## Description
+Feed snapshot repository with persistence, a fixture harvester command for feed snapshots, and CLI feed commands for managing snapshots.
+
+## Implementation Details
+- **Command Handlers**: `src/Cli/StellaOps.Cli/Commands/CommandHandlers.Feeds.cs` -- feed snapshot handlers
+- **Feed Commands**: `src/Cli/StellaOps.Cli/Commands/FeedsCommandGroup.cs` -- feed management including snapshots
+- **Config consolidation**: Feed commands consolidated under `stella config feeds`
+- **Commands**:
+  - `stella config feeds snapshot create` -- create a feed snapshot for deterministic replay
+  - `stella config feeds snapshot list` -- list available feed snapshots
+  - `stella config feeds snapshot show <id>` -- show snapshot details
+  - `stella config feeds snapshot export <id> --output <path>` -- export snapshot for offline use
+
+## E2E Test Plan
+- [ ] Run `stella config feeds snapshot create` and verify snapshot created with timestamp
+- [ ] Run `stella config feeds snapshot list` and verify snapshots listed
+- [ ] Run `stella config feeds snapshot show <id>` and verify details including feed sources and hashes
+- [ ] Run `stella config feeds snapshot export <id>` and verify offline-usable bundle created
+- [ ] Verify snapshots enable deterministic replay of evaluations
+- [ ] Verify `--format json` output