feat(server,sandbox): move SSH connect and exec onto supervisor session relay#861

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pimlock wants to merge 3 commits intomainfrom

feat/supervisor-session-relay

Commits on Apr 16, 2026

feat(server,sandbox): move SSH connect and exec onto supervisor session relay
pimlock
committed
fix(server): wait for supervisor session before opening relay
pimlock
committed
refactor(server): harden supervisor session relay lifecycle
pimlock
committed