fix: redirect Winston logger to stderr to prevent IPC stream corruption + fix binary tests

[RomneyDa]

Summary

• Fix Winston stdout corruption: Winston's Console transport writes directly to process.stdout, which corrupts the \r\n-delimited JSON IPC stream between the binary and JetBrains plugin. Redirected all Winston log levels to stderr instead.
• Fix binary tests: Replaced ReverseMessageIde with BinaryIdeHandler that responds with plain data matching the Kotlin CoreMessenger format, added response unwrapping for test assertions, and updated stale test expectations (models → modelsByRole, expected files).

Test plan

• Binary tests pass locally (6/6)
• Binary tests pass in CI across all platforms

[continue]

No documentation updates needed for this PR.

This change fixes internal test infrastructure by wiring up ReverseMessageIde in binary tests and adjusting Jest timeouts. These modifications are confined to the test suite (binary/test/binary.test.ts) and don't affect any user-facing APIs, configuration options, or documented workflows.

[cubic-dev-ai]

No issues found across 1 file

[cubic-dev-ai]

2 issues found across 2 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="binary/test/binary.test.ts">

<violation number="1" location="binary/test/binary.test.ts:85">
P2: Avoid per-chunk `Buffer.toString()` for stdout IPC parsing; use stream UTF-8 decoding (`setEncoding("utf8")`) so split multibyte characters are handled correctly.

(Based on your team's feedback about Node.js child process stream decoding with UTF-8 StringDecoder.) [FEEDBACK_USED]</violation>

<violation number="2" location="binary/test/binary.test.ts:246">
P2: `BinaryIdeHandler` is created even in TCP mode where `subprocess` is undefined, which will crash test setup when `USE_TCP` is enabled.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}