semi implemented and features implemented save checkpoint

docs/features/unchecked/cli/deterministic-replayability-for-tests.md

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+# Deterministic Replayability for Tests
+
+## Module
+Cli
+
+## Status
+IMPLEMENTED
+
+## Description
+Test infrastructure includes determinism manifests, run manifest validation, test run attestation generation, and golden output replay verification, supporting the advisory's call for deterministic replayability.
+
+## Implementation Details
+- **Replay Infrastructure**: `src/Cli/StellaOps.Cli/Replay/` -- replay command and manifest handling
+- **Determinism Tests**: `src/Cli/__Tests/StellaOps.Cli.Tests/Determinism/CliDeterminismTests.cs`, `AttestVerifyDeterminismTests.cs`
+- **Golden Output Tests**: `src/Cli/__Tests/StellaOps.Cli.Tests/GoldenOutput/DeterminismReplayGoldenTests.cs`
+- **Run Manifest**: `src/Cli/__Tests/StellaOps.Cli.Tests/Replay/RunManifestSerializerTests.cs` -- run manifest serialization
+- **Determinism Harness**: `src/Cli/StellaOps.Cli/Services/DeterminismHarness.cs` / `IDeterminismHarness.cs`
+- **Architecture**:
+  - Run manifests capture all inputs (hashes, versions, timestamps) for reproducible execution
+  - Golden output tests verify byte-identical output from identical inputs
+  - Determinism harness wraps execution with purity checks
+
+## E2E Test Plan
+- [ ] Verify determinism tests pass with identical outputs across runs
+- [ ] Verify run manifests capture all input hashes
+- [ ] Verify golden output replay produces byte-identical results
+- [ ] Verify determinism harness detects non-deterministic behavior
+- [ ] Verify run manifest serialization round-trips correctly
+- [ ] Verify attestation generation for test runs