libtmux:unbind-key

Remove exactly one KEY from TABLE and return a COMMAND-OUTCOME. TABLE defaults to prefix. Both strings are literal. A missing key in an existing table is a native no-op; an absent table is an error. Removing its last binding can delete the table, so repeated removal need not succeed. No bulk deletion, reset or retry is implicit. Blocks under shared preflight/dispatch limits. Success acknowledges removal and hooks; it cannot undo earlier key execution. Native errors and uncertain outcomes retain their diagnostics.