ST2110Nic.preflightComplete property

Resolves once the server-side gen_server is up and its preflight validation has passed (i.e. the NIC accepts commands), but BEFORE MTL_Init / MTL_Start have completed and BEFORE any IP address has been learned. Use this when downstream resource creation (NMOS devices, senders, receivers) can proceed without the wire being live yet — Norsk will queue any operation that requires MTL until MTL_Start completes. Use initialised instead when you intend to push or receive packets immediately. Rejects if preflight fails.

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