GPT 5.6 launch PowerPoint: Fable 5 vs Opus 4.8

/goal Build me a real PowerPoint deck (.pptx) briefing a non-technical team on OpenAI's GPT-5.6 launch.

Context: OpenAI just released the GPT-5.6 family — Sol, Terra, and Luna. The full launch announcement is in ./announcement.md in this folder. Read it first. Every fact in the deck must come from that file — if the announcement doesn't say it, the deck doesn't claim it.

Requirements:

1. A real .pptx file, built programmatically (python-pptx or equivalent) — it must open cleanly in PowerPoint and Keynote with correct fonts, alignment, and no overflowing text boxes.
2. 10-12 slides for a smart non-technical team deciding what their company should do: title; what launched in one line; the three tiers explained plainly (what each is for, who'd pick it); pricing compared; what's genuinely new vs the last generation; how it stacks against the other frontier models named in the announcement; 2-3 concrete "what this means for us" recommendations; a closing summary.
3. DESIGN like a top-tier consulting deck: one idea per slide, real visual hierarchy, a consistent restrained palette and type system, charts built from the announcement's actual numbers (pricing bars, tier comparison table) — never a wall of bullets.
4. Plain language throughout — a manager who has never used an API should follow every slide.
5. QA: render every slide to an image, review each one for overflow, misalignment, or filler, and fix what you find.

DONE when: the .pptx opens flawlessly, every fact traces to announcement.md, and the deck looks like it came from a serious strategy team, not a template.