Add MCP.callTool plus a dynamic jsonSchema mode for Tool.make, and register
each MCP server's tools as canonical Location-scoped tools via an McpTool
producer that reconciles on tools-changed notifications. Content-first tool
results preserve image/audio blocks; remove the arbitrary pagination page cap;
log mcp connection outcomes.
Tool naming keeps v1 parity (server_tool) so existing deny rules apply.
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