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