Implement engine-bridge PoC v1 (#9)
- Add Recordingtest.EngineBridge library (IEngineSnapshot, HmEgSnapshot
skeleton, MetadataLoader, CandidateFinder, CatalogWriter).
- Add Recordingtest.EngineBridge.Probe console exe that dumps
hmeg-types.json and hmeg-candidates.json to docs/engine-catalog.
- Add Recordingtest.EngineBridge.Tests (xUnit, 6 tests).
- Add probe design doc with plugin-masquerade recommendation.
- Static analysis only; SUT is never executed.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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