[SaladDay]

Summary

The OpenSandbox SDK builds a new http.Transport for the lifecycle client and another for the execd client on every ConnectSandbox. That means every Observe, Create and RunCommand opens new TCP connections, and the idle ones stay in the discarded transports for 30 s. The adapter now builds one client and passes it to both the ConnectionConfig and the lifecycle client, so every call to the server shares one transport. Timeouts are unchanged: the SDK still applies its 30-second request timeout to its own copy of the client.

Measurement

Fifty Observe + RunCommand pairs against the package's fake OpenSandbox server, three runs each, all identical:

	Before	After
New TCP connections	201	51
Goroutines left alive afterwards	455	5
Wall time (loopback)	285–295 ms	129–133 ms

The measurement test was temporary and is not committed.

Verification

• make check-sandbox-provider-contract passes.

---

^{Open in [code]smith · Need help on this PR? Tag @codesmith-bot with what you need.}