**3 issues found** across 78 files **Note:** This PR contains a large number of files. cubic only reviews up to 75 files per PR, so some files may not have been reviewed.

Prompt for AI agents (unresolved issues)

```text 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. P2: Handle failure when creating the persistent admin connection; otherwise a connect error can leak the spawned server process and temp directory. P2: Inline error-frame parsing skips the `msg_len` field and reads to end of payload, which can include trailing bytes. Use the existing `decodeErrorPayload` helper from `transport.ts` that correctly bounds the message read. P1: The wire error `code` from the ERROR frame is discarded and replaced with `ErrCode.INTERNAL`. This means frame-level errors (e.g., authentication failures) always surface as generic internal errors, preventing the client from throwing typed errors like `UnauthenticatedError`. ```

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