feat(spectrum): ship Voyage imagery, hoist mood into frame contract, prune M4-era styles

[jamiesun]

M9 second wave

The perception substrate moves into the framework, the M4-era style registry is pruned, and the first single-world imagery — 航线 · Voyage — ships on top of it. docs/roadmap.md M9 status updated accordingly.

航线 · Voyage (new imagery)

src/lib/spectrum/three/voyage.ts — a PBR capital ship on a fast course:

• Hull-as-equalizer armor bays, UV-free structure-bound weathering, selective Bloom, parallax deep-space field (nebulae, dark dust, clustered stars, planet, near particles)
• Weather transliterated for vacuum: rain → debris stream, storm → ion flashes
• Beat-launched energy pulses travel the hull conduits stern → bow
• Engine cluster built as a four-layer optic per the acceptance spec:
  1. faceted gunmetal nozzles — two concentric rings, backlit twelve-vane louver grille, machined hub; never enters Bloom
  2. compact cyan-white core, 31% of nozzle diameter, only the center approaches white
  3. parallel analytic jets — Gaussian radial falloff + continuous axial fade, ~3.15 diameters long
  4. restrained 1.7× deep-blue envelope carrying deterministic edge sparks (≤15% core brightness)
• Music response: bass → jet length ±20%, energy → core brightness ±15%, beat → 100 ms pulse; all attack/release smoothed, no radius pumping
• src/lib/spectrum/voyage.ts + voyage.test.ts: pure cruise / engine-response model (33 unit tests)
• examples/voyage-demo: esbuild harness (npm run demo:voyage) with scene legs and freeze/bloom/at query switches for deterministic captures

Bloom off / on comparison:

Bloom off	Bloom on
five parallel jets, nozzle rings and grille legible	cores + jets glow; nozzle structure preserved

Perception substrate (shared, pure)

• SpectrumFrame/ThreeFrame gain optional mood; SpectrumView owns the single MoodEngine, computed once per frame only while a moodAware style is active
• The mood scene consumes frame.mood (neutral-state fallback); the intent echo feeds the HUD

Registry prune

• Removed: wave, spectrogram, loopring, flux, terrain, rings, crystal
• bars remains the plain readout and universal fallback, mood the flagship imagery; auto picks between them until affinity selection lands

App shell

• Spectrum palette hue override — settings.spectrum_hue (CSS-hue validated in Rust) + Player UI control
• SceneRail filter and name/time sort (project.rs exposes modified_ms)
• VisualizerOverlay imagery-playback recording path
• New builtin style packs: aaa-game-score, eastern-wuxia
• examples/armor-material-lab (npm run demo:armor): hull weathering material workbench

Verification

• npm run check — 0 errors / 0 warnings
• npm test — 10 files, 104 tests passed
• npm run build — OK
• cargo fmt --check, cargo clippy, cargo test in src-tauri/ — clean