fix: stabilize auto director workflow recovery

[735140144]

Summary

• stabilize auto director continuation across planning, chapter execution, quality repair, and follow-up approval steps
• ensure auto director model calls follow model routing and structured response configuration
• keep task and novel list reads separated from task execution/recovery side effects

Verification

• conflict check against beta passed with a no-commit merge test
• existing commits include targeted server/client tests for workflow recovery, model routing, structured invoke, pipeline state, and auto director progression