Update Pi model limits and add Claude Opus 5

[tmustier]

Summary

• upgrade @earendil-works/pi-ai and @earendil-works/pi-agent-core from 0.80.8 to 0.83.0
• align GPT-5.6 with Pi AI's 272k effective context window on both OpenAI and Codex paths
• add and prefer Claude Opus 5 with its 1M context / 128k output metadata
• migrate direct agent streaming calls to the 0.83 streamFunction API
• update model registry assertions, release notes, smoke-test guidance, and model-update documentation
• pin the patched ip-address transitive version so the high-severity audit gate remains green

This supersedes the dependency-only update in #655 by including the required API migration and model metadata verification.

Verification

• npm ci
• npm run check
• npm run build
• npm run test:models — 59 passed
• npm run test:context — 745 passed
• npm run test:security — 108 passed
• npm audit --audit-level=high

[vercel]

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Project	Deployment	Actions	Updated (UTC)
pi-for-excel	Ready	Preview	Aug 3, 2026 9:39pm