Adopt Anthropic computer and browser toolsets

[rgarcia]

summary

• update Anthropic's computer and browser integrations to use computer_toolset_20260801 and browser_toolset_20260801
• preserve member toolset_name data through pi's function-tool transcript and emit structured browser tab state
• support the documented browser members, allow computer and browser toolsets together, and validate tab state at the protocol boundary

testing

• npm run typecheck
• npm run build --workspace @onkernel/browser-loop
• npm test --workspace @onkernel/browser-loop (440 tests)
• npx vitest --run --config vitest.integration.config.ts test/anthropic-native.integration.test.ts (live Anthropic computer/browser toolsets)
• live new_tab execution and browser_state continuation against a Kernel browser and the Anthropic API

[cursor]

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