feat: add claude-sonnet-4-6 model metadata to Anthropic adapter

[imsherrill]

🎯 Changes

Add claude-sonnet-4-6 to the Anthropic adapter's model metadata. This is a metadata-only addition — no API contract changes.

• Add CLAUDE_SONNET_4_6 constant with correct specs (1M native context window, 64k max output, adaptive thinking support)
• Register in ANTHROPIC_MODELS, AnthropicChatModelProviderOptionsByName, and AnthropicModelInputModalitiesByName
• Add type assertion tests for provider options and input modalities
• Add Sonnet 4.6 to the ts-react-chat example app model selector

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm run test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

Summary by CodeRabbit

Release Notes

• New Features
  • Added Claude Sonnet 4.6 model to the Anthropic provider with 1M token native context window and extended thinking capabilities. The model is now available for selection in chat applications and supports text, image, and document inputs with adaptive thinking features.

[changeset-bot]

🦋 Changeset detected

Latest commit: 58c6336

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@tanstack/ai-anthropic	Minor
@tanstack/tests-adapters	Patch
ts-svelte-chat	Patch
ts-vue-chat	Patch
@tanstack/smoke-tests-e2e	Patch

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 272e1f12-6988-4fae-b88d-d8f869e6e6b6

📥 Commits

Reviewing files that changed from the base of the PR and between 0e21282 and 58c6336.

📒 Files selected for processing (4)

• .changeset/add-claude-sonnet-4-6.md
• examples/ts-react-chat/src/lib/model-selection.ts
• packages/typescript/ai-anthropic/src/model-meta.ts
• packages/typescript/ai-anthropic/tests/model-meta.test.ts

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📝 Walkthrough

Walkthrough

This PR introduces support for the claude-sonnet-4-6 Anthropic model across the TanStack AI package. Changes include registering model metadata with context window and feature specifications, integrating the model into example applications, and adding comprehensive test coverage validating the model's configuration and input modalities.

Changes

Cohort / File(s)	Summary
Changeset & Documentation .changeset/add-claude-sonnet-4-6.md	Documents a minor version bump to @tanstack/ai-anthropic introducing claude-sonnet-4-6 with 1M context window and adaptive thinking support.
Core Model Metadata packages/typescript/ai-anthropic/src/model-meta.ts	Adds CLAUDE_SONNET_4_6 model metadata (context window, pricing, supports), registers it in ANTHROPIC_MODELS, and extends AnthropicChatModelProviderOptionsByName and AnthropicModelInputModalitiesByName maps.
Model Tests packages/typescript/ai-anthropic/tests/model-meta.test.ts	Adds test cases validating claude-sonnet-4-6 provider options (thinking, service_tier, etc.), type completeness, and input modalities (text, image, document).
Example Integration examples/ts-react-chat/src/lib/model-selection.ts	Adds claude-sonnet-4-6 as a new selectable option in the example chat application's MODEL_OPTIONS array.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A rabbit hops with pure delight,
Claude Sonnet 4.6 shines so bright!
One million tokens to explore,
Adaptive thinking forevermore! ✨🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding Claude Sonnet 4.6 model metadata to the Anthropic adapter, which aligns with the changeset and all code modifications.
Description check	✅ Passed	The description follows the template structure, clearly documents all changes made, marks all checklist items appropriately, and confirms that a changeset was generated for this feature addition.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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📝 Coding Plan

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