eLabSDK2.Bootloader.AddonChannel

Per-add-on MessagePort wrapper. One instance owns the host-side end of the MessageChannel created by IframeFactory; the iframe-side end was transferred during init. Responsibilities:

• Outbound request(method, args) → assigns a request id, writes a pending entry, posts the message, returns a Promise that the RpcBroker (incoming-message handler) resolves or rejects on the matching result / error reply.
• Outbound fire-and-forget send(msg) for messages without a reply (e.g. reinit, dispose-handlers).
• Routing of inbound messages (port.onmessage) into a handler the RpcBroker installs via setIncomingHandler — so the broker is the single place where SDK calls and addon-error events are interpreted.
• Disposal: close() rejects every pending request with AbortError, closes the port, and is idempotent.

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