# Notification Rules Engine

## Module
Notifier

## Status
IMPLEMENTED

## Description
Rules engine with NotifyRule model, rule evaluator interface, evaluation outcomes, and schema migration support.

## Implementation Details
- **DefaultNotifyRuleEvaluator**: `src/Notifier/StellaOps.Notifier/StellaOps.Notifier.Worker/Processing/DefaultNotifyRuleEvaluator.cs` -- evaluates `NotifyRule` against `NotifyEvent`; matches on event kind, namespace, repository, digest, severity (ranked none=0 through blocker=6); returns `NotifyRuleEvaluationOutcome` with match/not-matched reason
- **NotifierEventProcessor**: `src/Notifier/StellaOps.Notifier/StellaOps.Notifier.Worker/Processing/NotifierEventProcessor.cs` -- integrates rule evaluation into the event processing pipeline
- **SimulationEngine**: `src/Notifier/StellaOps.Notifier/StellaOps.Notifier.Worker/Simulation/SimulationEngine.cs` -- dry-run simulation of rule evaluation
- **DefaultNotifySimulationEngine**: `src/Notifier/StellaOps.Notifier/StellaOps.Notifier.Worker/Simulation/DefaultNotifySimulationEngine.cs` -- default simulation engine implementation
- **ISimulationEngine**: `src/Notifier/StellaOps.Notifier/StellaOps.Notifier.Worker/Simulation/ISimulationEngine.cs` -- simulation interface
- **RuleEndpoints**: `src/Notifier/StellaOps.Notifier/StellaOps.Notifier.WebService/Endpoints/RuleEndpoints.cs` -- REST API for rule CRUD and testing
- **SimulationEndpoints**: `src/Notifier/StellaOps.Notifier/StellaOps.Notifier.WebService/Endpoints/SimulationEndpoints.cs` -- REST API for rule simulation
- **RiskTemplateSeeder**: `src/Notifier/StellaOps.Notifier/StellaOps.Notifier.WebService/Setup/RiskTemplateSeeder.cs` -- seeds default risk notification rules
- **AttestationTemplateSeeder**: `src/Notifier/StellaOps.Notifier/StellaOps.Notifier.WebService/Setup/AttestationTemplateSeeder.cs` -- seeds attestation notification rules
- **InMemoryNotifyRepositories**: `src/Notifier/StellaOps.Notifier/StellaOps.Notifier.Worker/Storage/InMemoryNotifyRepositories.cs` -- in-memory rule storage
- **Sample rules**: `src/Notifier/StellaOps.Notifier/StellaOps.Notifier.docs/risk-rules.sample.json`
- **Tests**: `src/Notifier/StellaOps.Notifier/StellaOps.Notifier.Tests/RuleEvaluatorTests.cs`, `Simulation/SimulationEngineTests.cs`, `EventProcessorTests.cs`, `Endpoints/NotifyApiEndpointsTests.cs`
- **Source**: Feature matrix scan

## E2E Test Plan
- [ ] Verify rule evaluator matches events by kind, namespace, repository, and severity
- [ ] Test disabled rules are skipped with "rule_disabled" reason
- [ ] Verify severity-based filtering (e.g., minimum severity threshold)
- [ ] Test rule CRUD through RuleEndpoints API
- [ ] Verify simulation endpoints allow dry-run rule testing without side effects
- [ ] Test seeded default rules for risk and attestation scenarios