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Feature Request: explicit, authenticated remote TUI access

Feature Request: explicit, authenticated remote TUI access: a task in LegoFlow-SWE (Harbor dataset). holon tui currently has no clean remote-connection mode. Attempts to reach a remote holon serve instance: - silently fall back to the local Unix socket, - use ambiguous host/address semantics, and…

The task

`holon tui` currently has no clean remote-connection mode. Attempts to reach a remote `holon serve` instance: - silently fall back to the local Unix socket, - use ambiguous host/address semantics, and - offer no authentication for non-loopback TCP.

Part of Lego-X/LegoFlow-SWE.