Skip run command request when disconnected

[MaggieShan]

Description

• Context: https://warpdev.slack.com/archives/C0AMRA82ZKL/p1779143889865059
• We're getting a lot of client error related to the run command request failing when the session is disconnected - this pr ensures that we're not sending any run command requests unless the remote server client is actually connected (we reuse the disconnected flag)

Testing

Tested manually that the request is not sent + verified the tests pass

• I have manually tested my changes locally with ./script/run

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

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@MaggieShan

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Overview

This PR adds a non-blocking disconnected-state check to the remote-server-backed command executor so it skips remote RunCommand requests after the client has observed a disconnect. It also exposes the client disconnected flag and adds focused tests for the flag state.

Concerns

No blocking correctness, security, or spec-alignment concerns found. The provided spec context says no approved or repository spec context was found for this PR.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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