Summary

Model cost calculation (resolveModelCostConfig, resolveModelAuthMode, response usage cost display) is dead code in RemoteClaw. CLI runtimes manage their own API keys and billing — RemoteClaw doesn't have per-token cost tracking.

What to Remove

• resolveModelCostConfig() calls in agent-runner.ts
• resolveModelAuthMode() calls
• Response usage cost display logic (showCost conditional)
• Cost-related fields in session entries if any

Acceptance Criteria

• Given a message is processed
  When usage is reported
  Then no cost calculation or display logic runs

• pnpm check passes

• Existing tests pass

Depends On

• Fallback system removal (gut(session): remove vestigial model fallback system #2106) — cost logic interleaves with fallback