Move unit tests from tests/unit/ to internal/ following Go conventions:
- tests/unit/queue/* -> internal/queue/* (dedup, filesystem_fallback, queue_permissions, queue_spec, queue, sqlite_queue tests)
- tests/unit/gpu/* -> internal/resources/* (gpu_detector, gpu_golden tests)
- tests/unit/resources/* -> internal/resources/* (manager_test.go)
Update import paths in test files to reflect new locations.
Note: GPU tests consolidated into resources package since GPU detection is part of resource management. Manager tests show significant new test coverage (166 lines).
Rename and enhance existing tests to align with coverage map:
- TestGPUDetectorAMDVendorAlias -> TestAMDAliasManifestRecord
- TestScanArtifacts_SkipsKnownPathsAndLogs -> TestScanExclusionsRecorded
- Add env var expansion verification to TestHIPAAValidation_InlineCredentials
- Record exclusions in manifest.Artifacts for audit trail
- Surface GPUDetectionInfo from parseGPUCountFromConfig for detection metadata
- Document FETCH_ML_TOTAL_CPU and FETCH_ML_GPU_SLOTS_PER_GPU env vars
- Add debug logging for all env var overrides to stderr
- Track config-layer auto-detection in GPUDetectionInfo.ConfigLayerAutoDetected
- Add --include-all flag to artifact scanner (includeAll parameter)
- Add AMD production mode enforcement (error in non-local mode)
- Add GPU detector unit tests for env overrides and AMD aliasing
