Maity: Board

cli: best-effort chat-recipient hints

tsk-q7wxkw6zkfx4 done fix an agent

Follow-up after the merged chat-recipient hint, explicitly requested by the manager: treat failed GET conversations during the optional recipient hint as best-effort, preserving the normal recipient/type outcome. Cover a 500 conversation read with a regression test. Document why actual conversation IDs are read on the unmatched-recipient error path and why hint-read failures do not replace the main command outcome.