# Promotion Decision Engine (Gate + Approval Combination)

## Module
ReleaseOrchestrator

## Status
IMPLEMENTED

## Description
Decision engine combining gate evaluation results and approval status into final promotion decisions. Generates decision records with evidence, supports configurable decision rules, and maintains decision history.

## Implementation Details
- **Modules**: `src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Promotion/Decision/`
- **Key Classes**:
  - `DecisionEngine` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Promotion/Decision/DecisionEngine.cs`) - combines gate evaluation results and approval status into promotion decisions
  - `DecisionRecorder` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Promotion/Decision/DecisionRecorder.cs`) - records decision outcomes with evidence for auditability
  - `DecisionRules` (`src/ReleaseOrchestrator/__Libraries/StellaOps.ReleaseOrchestrator.Promotion/Decision/DecisionRules.cs`) - configurable rules for combining gate and approval results
- **Interfaces**: `IDecisionEngine`
- **Source**: SPRINT_20260110_106_005_PROMOT_decision_engine.md

## E2E Test Plan
- [ ] Submit gate results and approval status to `DecisionEngine` and verify a promotion decision is produced
- [ ] Verify decision with all gates passing and approval granted results in "Approved" decision
- [ ] Verify decision with a failing gate results in "Rejected" decision regardless of approval status
- [ ] Verify `DecisionRecorder` persists decision records with evidence references
- [ ] Configure custom `DecisionRules` and verify the engine applies them correctly
- [ ] Query decision history and verify past decisions are retrievable