Add Claude Opus 5 support

[rgarcia]

Adds anthropic:claude-opus-5 to cua-ai, cua-agent, and cua-cli with its current context, output, pricing, and adaptive-thinking metadata. Also enables the live-verified Anthropic native computer and browser tools for Opus 5.

Validated with the full build and test suites plus live canonical, native-computer, and native-browser smoke tests.

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Note

Low Risk
Mostly catalog metadata, allowlists, and documentation; no auth or execution-path refactors beyond registering a new model family.

Overview
Adds anthropic:claude-opus-5 across cua-ai, cua-agent, and cua-cli so it can be selected like other curated CUA models.

In @onkernel/cua-ai, the model is registered via a claude-opus-5 family annotation and a CUA_MODEL_OVERRIDES entry (1M context, 128k output, pricing, adaptive thinking with xhigh/max, forceAdaptiveThinking) until pi-ai’s catalog catches up. claude-opus-5 is included in the July 2026 native tool allowlists for computer_20260701 and browser_20260701, and the Anthropic provider treats it as an adaptive-thinking model for payload conversion.

Docs, CLI help (--native-tool eligibility), examples, and tests/e2e defaults are updated from claude-opus-4-7 to claude-opus-5 where Opus is the showcased Anthropic ref.

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