packages/ai: add computer-use support for claude-sonnet-5

[masnwilliams]

Summary

• Adds claude-sonnet-5 as a CUA-supported Anthropic model so @onkernel/cua-ai resolves anthropic:claude-sonnet-5. Before this, getCuaModel("anthropic:claude-sonnet-5") threw unsupported CUA model.
• Two-part change per the update-models skill: a CUA_MODEL_ANNOTATIONS family annotation (marks the family computer-use-supporting), plus a CUA_MODEL_OVERRIDES entry (pi-ai's registry does not carry the model yet, so the override lets getCuaModel() return a provider-shaped model). Docs snapshot updated to match.

Why

Claude Sonnet 5 shipped 2026-06-30 with computer-use support and Opus-class agentic performance at lower cost, making it a strong default for CUA/browser workloads. The model id wasn't in the support table, so any consumer (agents, benchmarks) selecting it failed at model resolution.

Validation

• npm run typecheck — clean.
• npm test --workspace @onkernel/cua-ai — models.test.ts passes; the lone failure in api-keys.test.ts is pre-existing env pollution (passes under a clean env, unrelated to this change).
• getCuaModel("anthropic:claude-sonnet-5") resolves; listCuaModels("anthropic") includes it.
• Live tool-call smoke: CUA_MODEL=anthropic:claude-sonnet-5 npm run example:quickstart emits a click computer tool call.
• End-to-end on a Kernel browser via the cua agent (Online-Mind2Web task): completed and graded SUCCESS.

Notes

• Covers the base id claude-sonnet-5. Dated snapshots (e.g. claude-sonnet-5-YYYYMMDD) resolve once pi-ai's registry picks the model up, or can be added as explicit overrides if needed sooner (same as the gpt-5.5-2026-04-23 precedent).

🤖 Generated with Claude Code

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Note

Low Risk
Small curated model-table and documentation updates with no auth, runtime, or API behavior changes beyond allowing one new model ref.

Overview
Adds claude-sonnet-5 to @onkernel/cua-ai so anthropic:claude-sonnet-5 resolves for computer-use workflows instead of failing with unsupported CUA model.

The change follows the existing update-models pattern: a claude-sonnet-5 family entry in CUA_MODEL_ANNOTATIONS (filter + dated snapshot suffixes), a CUA_MODEL_OVERRIDES cuaModel stub while pi-ai’s registry lacks the id, and the same family listed in supported-models.md.

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