Repair train physics and C:EE integration

[cat4blep]

What changed

• repairs train physics calculations, multi-engine power aggregation, curve safety, handbrake behavior, and persistent fuel accounting
• enforces the requireFuel configuration for combustion traction
• integrates Create: Electro Energetics train power state so electric motors cannot provide traction without usable catenary, accumulator, or creative power
• expands supported motor tags and Steam 'n' Rails compatibility
• adds focused unit coverage for traction, power, fuel, and physics policies
• bundles an automatically enabled client resource pack that silences the four problematic default C:EE GTO layers:
  • electroenergetics:train/gto/async
  • electroenergetics:train/gto/async_decay
  • electroenergetics:train/gto/async_rise
  • electroenergetics:train/gto/p15

The C:EE wind_static and wind_rise ambience remains unchanged.

Why

The public upstream build does not correctly respect C:EE electrical availability and can overwrite or ignore combustion fuel state. Its default GTO sound layers are also disproportionately loud and unsuitable as a universal train profile.

Validation

• ./gradlew build
• 44/44 unit tests passed
• built JAR inspected for version 0.2.0-beta.1 and all four nested silent Vorbis assets
• each replacement is valid mono Ogg Vorbis, 44.1 kHz, 1 second

Runtime verification with C:EE 1.21.1-1.1.1 is intentionally requested through the beta release.