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docs/features/checked/excititor/trust-vector-calibration-system.md

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+# Trust Vector Calibration System
+
+## Module
+Excititor
+
+## Status
+VERIFIED
+
+## Description
+Full trust calibration system including: DefaultTrustVectors (per-source baseline trust), SourceClassificationService, CalibrationManifest (versioned calibration snapshots), CalibrationComparisonEngine (post-mortem comparison), TrustVectorCalibrator with learning rate, and TrustCalibrationService. Distinct from "VEX Source Trust Scoring" which is about individual scoring; this is the calibration/tuning infrastructure.
+
+## Implementation Details
+- **Modules**: `src/Excititor/__Libraries/StellaOps.Excititor.Core/Calibration/`, `src/Excititor/__Libraries/StellaOps.Excititor.Core/TrustVector/`
+- **Key Classes**:
+  - `TrustCalibrationService` (`src/Excititor/__Libraries/StellaOps.Excititor.Core/Calibration/TrustCalibrationService.cs`) - orchestrates trust vector calibration
+  - `TrustVectorCalibrator` (`src/Excititor/__Libraries/StellaOps.Excititor.Core/Calibration/TrustVectorCalibrator.cs`) - calibrates trust vectors with configurable learning rate
+  - `CalibrationComparisonEngine` (`src/Excititor/__Libraries/StellaOps.Excititor.Core/Calibration/CalibrationComparisonEngine.cs`) - post-mortem comparison of calibration snapshots
+  - `CalibrationManifest` (`src/Excititor/__Libraries/StellaOps.Excititor.Core/Calibration/CalibrationManifest.cs`) - versioned calibration snapshot model
+  - `DefaultTrustVectors` (`src/Excititor/__Libraries/StellaOps.Excititor.Core/TrustVector/DefaultTrustVectors.cs`) - per-source baseline trust values
+  - `SourceClassificationService` (`src/Excititor/__Libraries/StellaOps.Excititor.Core/TrustVector/SourceClassificationService.cs`) - classifies VEX sources for trust assignment
+  - `TrustVector` (`src/Excititor/__Libraries/StellaOps.Excititor.Core/TrustVector/TrustVector.cs`) - trust vector model with multi-dimensional scores
+  - `TrustWeights` (`src/Excititor/__Libraries/StellaOps.Excititor.Core/TrustVector/TrustWeights.cs`) - configurable trust weights
+  - `FreshnessCalculator` (`src/Excititor/__Libraries/StellaOps.Excititor.Core/TrustVector/FreshnessCalculator.cs`) - calculates freshness component of trust vector
+  - `ProvenanceScorer` (`src/Excititor/__Libraries/StellaOps.Excititor.Core/TrustVector/ProvenanceScorer.cs`) - scores provenance for trust calculation
+  - `CoverageScorer` (`src/Excititor/__Libraries/StellaOps.Excititor.Core/TrustVector/CoverageScorer.cs`) - scores coverage for trust calculation
+  - `ReplayabilityScorer` (`src/Excititor/__Libraries/StellaOps.Excititor.Core/TrustVector/ReplayabilityScorer.cs`) - scores replayability for trust calculation
+- **Interfaces**: None (uses concrete calibration pipeline)
+- **Source**: SPRINT_7100_0002_0002_source_defaults_calibration.md
+
+## E2E Test Plan
+- [ ] Run `TrustCalibrationService` and verify it calibrates trust vectors based on historical VEX accuracy
+- [ ] Verify `TrustVectorCalibrator` adjusts trust scores with configurable learning rate (slow convergence)
+- [ ] Verify `CalibrationManifest` creates versioned snapshots of calibration state
+- [ ] Verify `CalibrationComparisonEngine` compares two manifests and reports trust score drift
+- [ ] Verify `DefaultTrustVectors` provides correct baseline values for vendor, distro, and internal sources
+- [ ] Verify `SourceClassificationService` classifies new VEX sources into correct categories
+- [ ] Verify individual scorers (Freshness, Provenance, Coverage, Replayability) contribute weighted scores to the trust vector
+
+## Verification
+- Verified on 2026-02-13 via `run-001`.
+- Tier 0: Source files confirmed present on disk.
+- Tier 1: `dotnet build` passed (0 errors); 503/504 tests passed (1 env_issue: no local Postgres).
+- Tier 2d: `docs/qa/feature-checks/runs/excititor/trust-vector-calibration-system/run-001/tier2-integration-check.json`