Two-stage LLM pipeline for Flexoptix-style blog generation:
- tip_blog_angle: identifies the real production situation as article angle (JSON)
- tip_blog_draft: writes continuous prose article — no headers, no bullets,
no AI filler. Gold article included as few-shot reference. v2.0.0 with
absolute format rules, DR4 wavelength correction (1310nm), fiber scope
vs OPM distinction, no invented firmware versions.
