Vouch request: Mohit20057

[Mohit20057]

What do you want to work on?

I want to work on #4946, I will update the SshHandler:: drop in crates/openshell-supervisors-process/src/ssh.rs as the issue propose this. After implementation the connection lingering non main processes are properly temninated while preerving the main session reconnectable, and will apply regression test for it.

Why this change?

• it abrupt disconnects leave orphan shells behind.
• They accumulate over time and then block all new sessions with "failed to start boundary exec".
• it forces user to manually hunt and kill PIDs to make the sandbox usuable again.
• fixing this keeps sandbox which long lived clean and stable .

Checklist

• I wrote this request myself (not AI-generated)
• I have read CONTRIBUTING.md