docs: polish README for Opus 4.8 launch#1
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Add launch hero sections to the top of the README: - "Now shipping: Claude Opus 4.8" callout linking the model guide and summarizing the 4.7 -> 4.8 drop-in path and required 4.6 -> 4.7 fixes - "Our approach to migration" with an ASCII pipeline diagram showing the Opus 4.7 -> ModelPort -> Opus 4.8 behavior-preserving flow and all 7 phases - "Outcomes: with vs. without ModelPort" split-column comparison Also refresh stale docs: list references/models/ and output-style.md in the repository structure block, and update the roadmap to reflect that the Claude/GPT-5.5 model guides already ship. ASCII art uses width-safe glyphs only so box borders stay aligned on GitHub.
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What
Polishes the README to lead with the Claude Opus 4.8 launch (released 2026-05-28) and to make ModelPort's migration approach legible at a glance.
Added (top of README)
references/models/claude-opus-4-8.md, summarizing the 4.7 → 4.8 drop-in path and the required 4.6 → 4.7 breaking changes, with a copy-paste migration prompt.[ Opus 4.7 ] ═══> ( ModelPort ) ═══> [ Opus 4.8 ]flow and all 7 phases as····· [ OK ]gates.Fixed (stale docs)
references/models/andreferences/output-style.md.Notes
▶ ▸ ✗ ⇒), so box borders stay aligned when GitHub renders them.python3 scripts/validate_skill.py .→ valid;markdownlint-cli2 README.md→ 0 errors.