semi implemented and features implemented save checkpoint

docs/features/unchecked/airgap/mirror-time-anchor-contract.md

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+# Mirror Time Anchor Contract
+
+## Module
+AirGap
+
+## Status
+IMPLEMENTED
+
+## Description
+Defines canonical time-anchor fields (generatedAt UTC ISO-8601, optional sourceClock hint) and staleness computation (now - generatedAt with +/-5s tolerance) for mirror bundles in air-gapped environments.
+
+## Implementation Details
+- **Time anchor module**: `src/AirGap/StellaOps.AirGap.Time/` -- full module with controllers, services, parsing, models, stores, config, hooks, health checks
+- **Time anchor parsing**: `src/AirGap/StellaOps.AirGap.Time/Parsing/` -- token parsing for time anchor extraction
+- **Staleness calculation**: services compute `now - generatedAt` with tolerance handling
+- **HLC merge services**: `src/AirGap/StellaOps.AirGap.Time/Services/` -- Hybrid Logical Clock for multi-node sync
+- **Deterministic time fixtures**: `src/AirGap/StellaOps.AirGap.Time/fixtures/`
+- **Bundle integration**: `src/AirGap/__Libraries/StellaOps.AirGap.Bundle/Services/` -- TimeAnchorContent, SnapshotBundleWriter.Sections.TimeAnchor, SnapshotBundleReader.Verify.TimeAnchor
+- **Attestor timestamping**: `src/Attestor/__Libraries/StellaOps.Attestor.Timestamping/TimeCorrelationValidator.Validate.cs`, `TimeCorrelationStatus.cs`
+- **Tests**: `src/AirGap/__Tests/StellaOps.AirGap.Time.Tests/` (TimeAnchorLoaderTests, StalenessCalculatorTests, TimeVerificationServiceTests, TimeTokenParserTests, etc.)
+
+## E2E Test Plan
+- [ ] Verify time anchor is embedded in air-gap bundle with correct ISO-8601 format
+- [ ] Verify staleness calculation correctly computes age with +/-5s tolerance
+- [ ] Verify time anchor verification rejects bundles with tampered timestamps
+- [ ] Verify HLC merge produces consistent ordering across multiple nodes
+
+## Related Documentation
+- Source: SPRINT_0150_0001_0002_mirror_time.md