feat: add optional motion tilt input

[replghost]

What

• add the optional motion-tilt App Manifest v2 feature and 40-byte PMT1 sample contract
• require every ABI v1 host to resolve host_motion_read; hosts without sensors return 0 instead of trapping the guest
• retain only the newest calibrated sample and expose set/clear APIs through native FFI and browser workers
• support cooperative, translated, interpreter, and CoreVM execution paths
• accept post-start WebGPU capability updates so guests can recover from stale surface generations during resize
• regenerate source-bound browser runtime assets

Verification

• cargo test --workspace --all-features — 45 passed across 8 suites
• npm test — 7 passed; embedded browser assets match the source build
• Chinpokomon native host smoke — motion delivery and pointer-only fallback both passed
• Chinpokomon resize smoke — stale surface batch rejection recovered and all 9 foil modes rendered
• Dotli compiler/WebGPU functional smoke — resize and subsequent input remained live