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Five things the first pass got wrong, in the order they bite.
`--until free --changed` waited on a command it had already missed: the
"something ran" edge is only set by a poll that catches the pane busy, and a
command that starts and finishes inside one 500ms interval never is. That is
indistinguishable from a command that never ran, so the timeout now names both
doors instead of letting a finished build read as a hang.
`free` also outranked the agent ladder, which is backwards. A pane whose depth-0
process *is* the agent — the tree cannot tell that apart from a shell at its
prompt — reads free for its whole turn, so a `waiting` the caller explicitly
asked for could be overwritten by a process-tree fact and then withheld by the
`--changed` rule that comes with it. `free` is now consulted only when none of
the requested agent states answered, which is both cheaper and what the docs
already claimed. An empty process tree is "we could not see in" rather than
"free" for the same reason `no-agent` exists.
`--key M-X` sent `ESC x`: the whole spelling was folded to lowercase, which is
free for Ctrl (the C0 rule clears the case anyway) and wrong for Alt, where the
character rides through as itself.
`send --help` listed the key vocabulary by hand next to the table it is a list
of; it had already drifted by one alias. It is generated now.
And a `pane close` batch that could not close everything raised an error, which
left `--json` holding prose exactly when a cleanup script needs to know which
panes are still its problem. It exits 1 with `{"closed":[…],"failed":[…]}`, with
the complaint still on stderr so `-q` reports it.