# Trust Vector Calibration System

## Module
Excititor

## Status
IMPLEMENTED

## 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