JVNAUTOSCI-1203: persist durable turn-execution structure and add instance filters

[witbrock]

Summary

• persist canonical per-turn execution telemetry in durable workflow instances:
  • inputs.turn_execution_contract
  • workflow_data.turn_execution_runtime
  • outputs.turn_execution_outcome
• include explicit step_instances, check_instances, critic_verdict, and completion_state in terminal outcome payloads
• persist runtime snapshot before terminal transition so exception paths keep actionable telemetry
• extend workflow_list_instances filters with session_id, request_id, from_utc, and to_utc
• wire new filters through MCP catalogue schema and manager query path

Tests

• pdm run pytest tests/backend/test_orchestrator_durable_instance_telemetry.py tests/backend/test_orchestrator_turn_execution_gate.py tests/backend/test_turn_execution_workflow_definitions.py tests/backend/test_orchestrator_workflow_selector_routing.py
• pdm run pytest tests/backend/test_internal_mcp_workflow_tools.py tests/backend/test_durable_workflow_system.py -k "list_instances or create_instance_for_event"
• pdm run pyright $(git diff --name-only -- '*.py')