Harden live execution safety boundaries

[Mopati123]

Summary

• Fail closed for unknown live execution token authority and require scheduler/authority-issued token shapes.
• Add broker-boundary demo guards for MT5 and Deriv, plus Deriv one-active-contract protection.
• Make Stage 13 entropy refusal a hard precondition before scheduler collapse.
• Harden execution evidence appends and PPO feedback durability.
• Add a small Windows Torch import compatibility guard for local validation reliability.

Safety

• No broker execution was run.
• No Deriv or MT5 canary was run.
• No runtime logs/, data/, .env, .github drift, or runner drift is included.

Validation

• git diff --cached --check
• python -m pytest tests/rootfile -q -> 111 passed
• python -m pytest tests -q -> 204 passed, 9 warnings
• verify_execution_evidence_chain('logs/execution_evidence.jsonl') -> valid

Kluster

• kluster was attempted during implementation, but the trial has ended and no actionable review output was available.