Summary

The model fallback transition system (resolveFallbackTransition, fallback notices, fallback state in session entries) is dead code in RemoteClaw. CLI runtimes manage their own model selection — RemoteClaw has no model fallback.

What to Remove

• resolveFallbackTransition() calls and surrounding logic in agent-runner.ts:448-466
• Fallback notice building and delivery (buildFallbackNotice, buildFallbackNoticePayload)
• Session entry fields: fallbackNoticeSelectedModel, fallbackNoticeActiveModel, fallbackNoticeReason
• fallbackProvider, fallbackModel, fallbackAttempts variables in agent-runner.ts
• selectedProvider, selectedModel tracking (only used for fallback comparison)

Acceptance Criteria

• Given a message is processed
  When the agent runner executes
  Then no fallback transition logic runs

• Given the session store
  When entries are written
  Then no fallbackNotice* fields are present

• pnpm check passes

• Existing tests pass (or are updated to remove fallback assertions)

Depends On

• fix(session): CLI session key mismatch — provider 'unknown' vs runtime name #2105 (CLI session key mismatch fix — establishes runtime-based provider)