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save checkpoint: save features

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# Immutable Advisory Feed Snapshots
## Module
Replay
## Status
VERIFIED
## Description
Replay provides immutable, content-addressed advisory feed snapshots that can be queried by provider and time anchor for deterministic replay workflows.
## What's Implemented
- **Feed Snapshot Capture and Storage**: `src/Replay/__Libraries/StellaOps.Replay.Core/FeedSnapshots/FeedSnapshotService.cs` captures per-provider snapshots as immutable blobs and stores them by digest.
- **Content Addressing and Integrity Checks**: `src/Replay/__Libraries/StellaOps.Replay.Core/FeedSnapshots/FeedSnapshotService.cs` computes SHA-256 digests and supports integrity verification against stored content.
- **Snapshot Indexing by Time**: `src/Replay/__Libraries/StellaOps.Replay.Core/FeedSnapshots/FeedSnapshotService.cs` and `IFeedSnapshotIndexStore` support provider/time lookups and listing for point-in-time resolution.
- **Point-in-Time Advisory Resolution Core**: `src/Replay/__Libraries/StellaOps.Replay.Core/FeedSnapshots/PointInTimeAdvisoryResolver.cs` resolves advisory state from snapshots at or before a requested timestamp.
- **Snapshot API Contract Surface**: `src/Replay/StellaOps.Replay.WebService/PointInTimeQueryEndpoints.cs` defines snapshot capture/get/verify/bundle and advisory query endpoint handlers.
- **Behavioral Coverage**:
- `src/Replay/__Tests/StellaOps.Replay.Core.Tests/FeedSnapshots/FeedSnapshotServiceTests.cs`
- `src/Replay/__Tests/StellaOps.Replay.Core.Tests/FeedSnapshots/PointInTimeAdvisoryResolverTests.cs`
- `src/Replay/__Tests/StellaOps.Replay.Core.Tests/FeedSnapshots/PointInTimeQueryEndpointsTests.cs`
## Verification
- Run ID: `run-003`
- Date (UTC): `2026-02-11`
- Tier 0: `pass` (`docs/qa/feature-checks/runs/replay/immutable-advisory-feed-snapshots/run-003/tier0-source-check.json`)
- Tier 1: `pass` (`docs/qa/feature-checks/runs/replay/immutable-advisory-feed-snapshots/run-003/tier1-build-check.json`)
- Tier 2: `pass` (`94/94`) (`docs/qa/feature-checks/runs/replay/immutable-advisory-feed-snapshots/run-003/tier2-integration-check.json`)
- Evidence directory: `docs/qa/feature-checks/runs/replay/immutable-advisory-feed-snapshots/run-003/evidence/`