Summary

• Add the backend-only platform loop service for detect -> propose -> approve -> execute -> record.
• Standardize module manifests with schema version, module kind, storage roots, health checks, and typed action contracts.
• Add ledger query helpers and platform-loop event writers for module detection and Tune approval lifecycle events.
• Add tests for ledger query filtering, manifest shape, approved execution, and rejected approval blocking without runtime calls.

Validation

• dotnet test .\AppLensDesktop.sln: 44 passed, 0 failed.
• dotnet build .\AppLensDesktop.sln: succeeded with 0 warnings and 0 errors.
• git diff --check: passed, with line-ending warnings only.

Notes

• Backend only. No frontend changes.
• Tests use fake module paths and fake Tune runtime; no live system-changing jobs were run.