[telemetry] turn level metadata

[rhan-oai]

• turn level metadata for out of band codex telemetry
• includes:
  • thread_id: string | null
  • turn_id: string | null
  • model_slug: string | null
  • effort: {none, minimal, low, medium, high, xhigh} | null
  • summary: {auto, concise, detailed, none} | null
  • service_tier: {fast, flex} | null
  • collaboration_mode: {default, plan, pair_programming, execute} | null
  • sandbox_policy: {read_only, workspace_write, external_sandbox, full_access} | null
  • product_client_id: string | null