feat(ground): add repeated-bounce evidence wire contract

[d-sorgcodexagent]

Summary

• add strict ground-repeated-bounce-result/v1 Python serialization/parsing for the complete validated repeated-bounce evidence prefix
• add import-only TypeScript parser/serializer parity without browser-side physics
• enforce exact nested keys, duplicate-key and UTF-8 size guards, frame/model/request identities, trajectory/event/impact chronology, passive energy accounting, terminal handoff, and typed termination invariants
• pin deterministic cross-runtime JSON/SHA evidence, including valid eventless pre-contact cancellation

Verification

• 162 Python ground tests passed in the complete candidate gate; 20 focused wire tests passed after the cancellation clarification
• 113 React test files / 712 tests passed in the complete candidate gate; 19 focused TypeScript wire tests passed after the clarification
• MyPy, Ruff/format, TypeScript, zero-warning ESLint, Cargo-related inherited gates, production build, manifest/docs/governance, module-size and diff checks passed locally
• independent review identified four evidence-integrity defects; each was fixed with matched adversarial coverage before publication

Scope boundary

This is an evidence/interchange boundary only. Request construction, UI executor invocation, persistence, playback, measured calibration, compiled-runtime parity, downstream consumer parity, protected release, and completion of #4267/#4270/#4271 remain open.

Part of #4270
Part of #4271
Part of #4267
Depends on #4354

[dieterolson]

Consolidated into #4409. Closing to reduce CI/CD runner load.