feat(hands): overhaul fighter animation, gore, and injury audio

[user1303836]

Summary

• rebuild the embedded boxer asset with 34 anatomy-checked clips, direction-aware gait, normalized blending, authored state transitions, and contact-synchronized reactions
• add deterministic full/reduced/off blood presentation with fixed-step particles, anatomical hit routing, dislocations, severed heads/hands, pooled stumps/gibs, and restoration
• generate six recording-free NumPy FM injury voices and route them through gesture-safe, lifecycle-safe Web Audio only when the matching arcade injury applies
• gzip the embedded GLB at generation time so the production activity remains within its exact three-file bundle budget

Validation

• uv run ruff check .
• uv run ruff format --check .
• uv run mypy src/
• uv run pytest tests/ — 1,891 passed
• cd web/hands && npm run typecheck
• cd web/hands && npm test -- --run — 19 files / 231 tests passed
• cd web/hands && npm run build — exact three-file static scan passed; hands.js is 4,703,153 bytes / 3,071,090 bytes gzip
• fighter and injury-audio generators reproduced byte-identical assets
• Chromium Model Lab visual pass covered all clips; production GLB loading and all six WAV decodes were verified

Review

Independent final review approved the latest tree with no remaining actionable findings.

Only HANDS paths changed. No files were deleted, and no live vector or SQLite databases were accessed.

[greptile-apps]

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