- ConsoleInputPump gains an optional ILogger so the reader-fault and
command-dispatch catch blocks log warnings/errors again, matching the
behavior the old ConsoleInputHandler had before the pump refactor.
- Remove ConsoleInputPump.Stop() — dead code, nothing calls it; the reader
thread already terminates on EOF/Core.Closing/finally cleanup.
- GetInputCommand no longer clears the help-description cache on every
lookup; RegisterCommand/UnregisterInputCommand still invalidate it
correctly on the paths that actually change the command set.
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