fix: orchestrate virtual JSON schema responses

[seonghobae]

Outcome

Virtual orchestrator json_schema requests now use the multi-agent conduct, local Draft 2020-12 validation, and ordinary-chat repair path. Provider-native structured-output support is no longer required for the virtual model.

Contract

• preserves the OpenAI chat completion envelope plus workflow, session, usage, and cost lineage
• shares one request deadline and failed-candidate scope across synthesis and repair
• returns typed no_viable_agent when every admitted repair candidate fails
• probes structured readiness through the same minimal-schema workflow
• rejects unsupported schema keywords as invalid_response_format

Verification

• 139 passed across structured passthrough, readiness registry, client boundary, model judge, cost, health, and API contract suites

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