fix: Queue messages sent to Continue binary #6457
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This is motivated by my latest crash on Windows (from yesterday).
I extracted an interface to describe two strategies of sending messages: standard input/output and TCP (for debugging). Now there is a handler that accepts this interface and safely queues messages. With this separation CoreMessenger now has fewer responsibilities. I tried to keep these changes as much local as possible.
Using Channel has an additional advantage: we can queue messages directly from AWT.
Summary by cubic
Refactored message sending to the Continue binary by introducing a process interface and handler that queues messages safely, reducing CoreMessenger responsibilities and improving stability.