[Claimed #2326] [STG-2497] docs: sync CUA model list with AgentProvider map

[github-actions]

Mirrored from external contributor PR #2326 after approval by @Kylejeong2.

Original author: @aq17
Original PR: #2326
Approved source head SHA: f7085b51cf1a25af736387d251ed8fa863d15df4

@aq17, please continue any follow-up discussion on this mirrored PR. When the external PR gets new commits, this same internal PR will be marked stale until the latest external commit is approved and refreshed here.

Original description

Summary

The All Supported CUA Models table in packages/docs/v3/configuration/models.mdx was missing 7 models that are already registered in packages/core/lib/v3/agent/AgentProvider.ts (modelToAgentProviderMap, lines 17–37). This PR brings the docs table in sync with the code.

Added rows:

• openai/gpt-5.4
• openai/gpt-5.4-mini
• openai/gpt-5.5
• anthropic/claude-sonnet-4-20250514
• anthropic/claude-haiku-4-5 (the short alias — only the dated claude-haiku-4-5-20251001 was listed)
• anthropic/claude-fable-5
• google/gemini-3.5-flash

Also lightly reordered the Anthropic and Google rows so variants of the same model family sit next to each other (haiku → sonnet → opus → fable; gemini-2.5 → gemini-3-flash → gemini-3.5-flash → gemini-3-pro).

Test plan

Docs-only change. No code touched. Rendered table matches the source-of-truth map at packages/core/lib/v3/agent/AgentProvider.ts.

Requested by: alexander@browserbase.com
Linear: https://linear.app/browserbase/issue/STG-2497/docs-sync-cua-model-list-with-agentprovider-map
Slack thread: https://browserbase.slack.com/archives/D0AHY8DEQPM/p1783452853684349

🤖 Generated with Claude Code

---

Summary by cubic

Synced the “All Supported CUA Models” table in packages/docs/v3/configuration/models.mdx with modelToAgentProviderMap in packages/core/lib/v3/agent/AgentProvider.ts, adding seven missing models and grouping families for clarity. Aligns the docs with code per Linear STG-2497 so users see all available CUA models.

^{Written for commit f7085b5. Summary will update on new commits.}

[github-actions]

This mirrored PR has been merged into main. The original external PR #2326 is now completed.

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