[eugene-mux]

Summary

Add a pure Standard Input policy and planner that selects original upload, whole-file SDR conversion, or original-file fallback from normalized media facts and proven capabilities.

• Apply resolution, codec, audio, and HDR rules with detailed compliance and fallback diagnostics.
• Plan output within the selected bounds without upscaling, preserve timestamps unless proven resampling is needed, and select the first audio track.
• Require source-specific conversion proof, including compliant AAC preparation and tone mapping. Pipeline integration follows separately.

Validation

• All 86 unit tests pass in debug and release with JDK 17, including 66 policy/planner tests.
• SDK and sample release builds, release lint-vital checks, and whitespace checks pass.
• Tests cover planning decisions; device conversion and live ingest remain separate verification.

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Note

Low Risk
New internal-only types and logic with no production call sites yet; behavior is heavily unit-tested and isolated from upload orchestration.

Overview
Introduces a pure, platform-agnostic Standard Input layer that turns normalized MediaFacts plus caller-supplied PlanningCapabilities into a StandardInputPlan: upload original, whole-file SDR conversion, or categorized fallback.

Policy (StandardInputPolicyEvaluator) applies Mux-published tier limits (aligned with Swift) across codec, resolution, frame rate, bitrates, GOP, pixel format, HDR (HEVC 10-bit 420 for HLG/PQ), audio, and edit lists—treating missing evidence as Unknown, not compliant.

Planner (StandardInputPlanner) wires InputStandardization / HdrHandling: preserves eligible HLG/PQ when compliant, tone-maps when requested, downscales within selected max resolution without upscaling (even-aligned dimensions), picks output cadence (preserve timestamps vs 30 fps resample), and gates conversion on explicit proof (decode/encode, per-requirement remediation, AAC preparation, tone mapping).

Adds shared test fixtures and 66+ unit tests for policy boundaries and planning edge cases (HDR, audio, capabilities, insufficient evidence). No upload pipeline integration in this PR.

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