Larger, cross-page WebMCP toolsets

WebMCP browser agents can now work across larger sites without loading every page-tool schema into the model context or stopping after navigation.

• Catalogs of up to 200 page tools. Multi-turn agents with tool search enabled start with a small active set and discover additional page tools through tool_search when needed.
• Fresh tools after navigation. Persona sends the current clientTools snapshot when it resumes a run. Runtype validates the refreshed set against the chat surface's WebMCP policy before making it available to the model.

Cross-page tasks such as searching a storefront, opening a product, and adding it to a cart can now finish in one agent run.