semi implemented and features implemented save checkpoint

docs/features/unchecked/advisoryai/deterministic-ai-artifact-replay.md

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+# Deterministic AI Artifact Replay
+
+## Module
+AdvisoryAI
+
+## Status
+IMPLEMENTED
+
+## Description
+Deterministic replay infrastructure for AI artifacts including replay manifests, prompt template versioning, and input artifact hashing for reproducible AI outputs.
+
+## Implementation Details
+- **Modules**: `src/AdvisoryAi/StellaOps.AdvisoryAI/Replay/`, `src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Replay/`
+- **Key Classes**:
+  - `AIArtifactReplayer` (`src/AdvisoryAi/StellaOps.AdvisoryAI/Replay/AIArtifactReplayer.cs`) - replays AI artifacts with deterministic inputs for verification
+  - `ReplayInputArtifact` (`src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Replay/ReplayInputArtifact.cs`) - input artifact model with content-addressed hashing
+  - `ReplayPromptTemplate` (`src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Replay/ReplayPromptTemplate.cs`) - versioned prompt templates for replay
+  - `ReplayResult` (`src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Replay/ReplayResult.cs`) - replay execution result with comparison data
+  - `ReplayVerificationResult` (`src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Replay/ReplayVerificationResult.cs`) - verification of replay output against original
+  - `ReplayStatus` (`src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Replay/ReplayStatus.cs`) - replay status tracking
+  - `DeterministicHashVectorEncoder` (`src/AdvisoryAi/StellaOps.AdvisoryAI/Vectorization/DeterministicHashVectorEncoder.cs`) - deterministic hash-based vector encoding for reproducibility
+- **Interfaces**: None (uses concrete replay pipeline)
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- [ ] Record an AI inference run and verify `AIArtifactReplayer` can replay it with identical inputs
+- [ ] Verify `ReplayInputArtifact` computes content-addressed hashes that match across replay invocations
+- [ ] Verify `ReplayPromptTemplate` versioning: replay with a v1 template produces the same output as the original v1 run
+- [ ] Verify `ReplayVerificationResult` detects differences when the replay output diverges from the original
+- [ ] Verify `DeterministicHashVectorEncoder` produces identical vectors for identical inputs across runs
+- [ ] Verify replay with temperature=0 and fixed seed produces bit-identical outputs for supported providers