Fix Repetitive Output in DeepSeek-V3

Instead of tuning legacy frequency_penalty or presence_penalty parameters on frontier models like DeepSeek-V3, fix repetitive output by adding explicit structural progression rules to the prompt.

Write a 5-stage incident post-mortem template. Ensure each stage addresses a mutually exclusive phase (Detection, Mitigation, Root Cause, Remediation, Prevention) with zero repeated questions across sections.