Enhancement request: auto-completion on debug evaluate expression

I would expect to find, but didn't, auto-completion when building expressions for instant evaluation, when you are stopped on a breakpoint in debug mode, for instance

The issue names no source files, tests, or entry points. Start by locating the IntelliJ plugin's debug evaluate-expression flow and clarify the expected completion behavior with maintainers; done requires an agreed implementation scope and validation for completion support.

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