Texture-pattern decoder handoff

vm_model/src/nitro_pattern.rs parses BTP0/PAT0 animation dictionaries and M\0PT tracks, targeting materials by name. Renderer integration now lives in game/src/driver_animation.rs (2026-10-08).

use vm_model::nitro_pattern::PatternAnimation;
let clips = PatternAnimation::parse_all(&bytes)?;
let selection = clips[0].sample("P_face", expression_frame);

The selection returns texture and optional palette names. A missing palette means retain the material's existing palette (original index 255). The caller must choose expression frames and implement looping when wanted; sampling holds the last key and does not create blink timings.

All 85 local pattern files parse; 361 live SDK selections match, but only the normal face was captured. tools/bizhawk/codex_pattern/run.ps1 reproduces the isolated capture; compare_pattern_capture compares captured RAM files. tests/data/pattern_runtime.csv retains the one unique normal-face selection.

Use nitro_playback::AnimationClock for ordinary original-game playback timing. The driver drive pose is explicitly controlled by steering, as documented in analysis/CODEX_ANIMATION_MAP.md. The renderer loads the shared face pattern from KartModelMain/character/common, preserves palette sentinel behavior, and switches detailed-driver materials to frame 1 during spin/lose and frame 0 otherwise. This follows sub_207B708 and sub_2068A64; live expression-transition timing still needs capture. No invented blink timer is added.