Eric Traut 4cd85b28d2 Fix MCP startup cancellation through app server (#18078)
Addresses https://github.com/openai/codex/issues/17143

Problem: TUI interrupts without an active turn stopped cancelling slow
MCP startup after routing through the app-server APIs.

Solution: Route no-active-turn interrupts through app-server as startup
cancels, acknowledge them immediately, and emit cancelled MCP startup
updates.

Testing: I manually confirmed that MCP cancellation didn't work prior to
this PR and works after the fix was in place.
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