[eugene-mux]

Summary

• add structured SDKLogger diagnostics for source and generated-output inspection, selected plans, codecs, resolution tier, HDR decisions, conversion duration, output validation, and categorized failures
• distinguish intentional HLG and PQ preservation, including the compatible server-processing decision, without emitting failure diagnostics
• keep publicly rendered diagnostics credential-safe through closed typed payloads; never render raw errors, URLs, file paths, headers, tokens, or credentials
• preserve existing lifecycle, fallback, cancellation, stale-attempt, and temporary-output ownership behavior

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Note

Low Risk
Observability-only changes along the existing preparation path; upload lifecycle, fallbacks, and cancellation behavior are unchanged aside from extra async log calls.

Overview
Adds structured OSLog diagnostics across the input standardization pipeline, replacing the ad-hoc debug plan log with injectable StandardizationDiagnosticLogging.

DirectUpload now emits typed events for source/generated inspection, plan selection (codec, resolution tier, HDR handling/decisions), conversion completion with duration, output validation, and categorized failures (inspection, capability, storage, conversion, output inspection/validation). Intentional HLG/PQ preservation is reflected in plan/HDR fields without standardization_failure events.

Diagnostics are built from closed vocabularies and sanitized media facts only—no raw errors, URLs, paths, or credentials in public log lines. Tests use a recording logger and assert expected fields plus that sensitive strings stay out of messages.

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