In cli stdin stream mode we should not create new tasks

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[roomote-v0]

Rooviewer   See task

Reviewed all changed files. No issues found -- the implementation is clean.

• json-event-emitter.ts: State-based prompt echo detection via handleStateChange is correct
• run.ts: Single-task model with queueMessage continuations handles edge cases properly
• test-stdin-stream.ts: Manual integration test script looks good
• package.json: Dev script addition is fine

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}