[Bug] Opus 4.7 quality regression and Thai CLI rendering broken with combining marks

Bug Description
Two regressions filed as GitHub issues: #51440 - Opus 4.7 quality regression + ~20-35% token cost increase vs 4.6 for production coding (Odoo ERP, Python+XML) #51444 - Thai CLI rendering broken (combining marks misaligned, cursor drift) - NOT fixable by font/terminal changes Max 20x subscriber, 8-12hr daily, professional Thai Odoo consultant. Full details + reproduction steps in linked GitHub issues. Key asks: 1. Commit to Opus 4.6 availability through end of 2026 2. Publish 4.6->4.7 prompt migration guide 3. Fix Thai/CJK CLI rendering (width calc for combining marks) 4. Add --plain-output flag as workaround for non-Latin users

Environment Info

• Platform: darwin
• Terminal: iTerm.app
• Version: 2.1.114
• Feedback ID: 25d2845e-8062-4476-8a40-495149366e2b

Errors

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