semi implemented and features implemented save checkpoint

docs/features/unchecked/taskrunner/sealed-mode-install-enforcer.md

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+# Sealed-Mode Install Enforcer (Air-Gap Support)
+
+## Module
+TaskRunner
+
+## Status
+IMPLEMENTED
+
+## Description
+Enforcer for sealed/air-gap mode that ensures task pack installations comply with offline constraints and logs all install actions for audit.
+
+## Implementation Details
+- **Enforcer interface**: `src/TaskRunner/StellaOps.TaskRunner/StellaOps.TaskRunner.Core/AirGap/ISealedInstallEnforcer.cs` -- sealed mode enforcement contract
+- **Enforcer implementation**: `src/TaskRunner/StellaOps.TaskRunner/StellaOps.TaskRunner.Core/AirGap/SealedInstallEnforcer.cs` -- validates installations comply with offline constraints
+- **Enforcement result**: `src/TaskRunner/StellaOps.TaskRunner/StellaOps.TaskRunner.Core/AirGap/SealedInstallEnforcementResult.cs` -- result model for enforcement checks
+- **Sealed mode status**: `src/TaskRunner/StellaOps.TaskRunner/StellaOps.TaskRunner.Core/AirGap/SealedModeStatus.cs` -- current sealed mode state
+- **Sealed requirements**: `src/TaskRunner/StellaOps.TaskRunner/StellaOps.TaskRunner.Core/AirGap/SealedRequirements.cs` -- requirements for sealed mode compliance
+- **Audit logger**: `src/TaskRunner/StellaOps.TaskRunner/StellaOps.TaskRunner.Core/AirGap/ISealedInstallAuditLogger.cs` -- audit logging for install actions
+- **Air-gap status provider**: `src/TaskRunner/StellaOps.TaskRunner/StellaOps.TaskRunner.Core/AirGap/IAirGapStatusProvider.cs` -- checks if system is in air-gap mode
+- **HTTP status provider**: `src/TaskRunner/StellaOps.TaskRunner/StellaOps.TaskRunner.Infrastructure/AirGap/HttpAirGapStatusProvider.cs` -- HTTP-based air-gap status check
+- **Bundle ingestion executor**: `src/TaskRunner/StellaOps.TaskRunner/StellaOps.TaskRunner.Infrastructure/Execution/BundleIngestionStepExecutor.cs` -- air-gap bundle ingestion step
+- **Tests**: `src/TaskRunner/StellaOps.TaskRunner/StellaOps.TaskRunner.Tests/SealedInstallEnforcerTests.cs`, `BundleIngestionStepExecutorTests.cs`
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- [ ] Verify enforcer blocks network-dependent installations in sealed mode
+- [ ] Test sealed mode status detection via HTTP provider
+- [ ] Verify audit logger records all install actions in sealed mode
+- [ ] Test bundle ingestion step works in offline environment
+- [ ] Verify enforcement result reports compliance violations