Replace retired OpenAI image models with gpt-image-2 (DALL-E shut down 2026-05-12)
- openai_image: enum narrowed to ["gpt-image-2"]; DALL-E code path, sizes
(1024x1792/1792x1024) and qualities (standard/hd) removed; estimate_cost
updated to real GPT Image 2 pricing ($0.006/$0.053/$0.211 at 1024x1024)
- image_gen (deprecated but callable): default dall-e-3 -> gpt-image-2; drop
response_format="b64_json", which GPT image models reject; update pricing
- docs/skills sweep: scrub retired-model references from README (en/zh),
.env.example, docs/PROVIDERS.md (incl. pricing table + deprecation note),
docs/ARCHITECTURE.md, AGENT_GUIDE.md, skills/creative/*, 14 pipeline
director skills, and tests/qa/QA_PLAN.md
Source: https://developers.openai.com/api/docs/deprecations
proofread by fable 5 + codex
fabc0e7088