feat: option to skip verification

[macandro96]

Summary

Adds a response API agent option to skip resources-server verification during /run.

When skip_verification=true, agents return a synthetic verify response using skip_verification_reward and mark it with verification_skipped=true. Top-level config values are propagated to response API agents unless the agent explicitly sets its own values.

Changes

• Add skip_verification and skip_verification_reward to base response API agent config.
• Add skipped-verification response payload helper.
• Wire skip behavior into simple_agent and tool_simulation_agent.
• Add global config propagation for top-level skip-verification defaults.
• Add tests for config defaults, payload construction, and agent /run behavior.

Cherry pick from here

[copy-pr-bot]

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[macandro96]

Moved it to here