Fix MCP startup cancellation through app server#18078
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dylan-hurd-oai
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Apr 16, 2026
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Addresses #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.