Propagate deferred environment capability roots to MCP - #33427
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## What changed - Let deferred environments provide selected capability roots with their ready signal. - Validate that those roots have unique, non-empty IDs, belong to the registering environment, and stay within the root limit. - Include roots from ready turn environments when resolving MCP contributions, and refresh the MCP runtime when the selected root set changes. - Expose the exact ready root set to MCP contributors so executor plugins become available with their environment. ## Testing - Cover ready-root propagation, validation failures, replacement isolation, reconnection, and MCP plugin availability refresh. GitOrigin-RevId: ec3498aab1164824025094e96a9b1063b7b731ad
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Propagate deferred environment capability roots to MCP
What changed
Testing