Fork ii's Session singleton and add a sessionctl.* surface.
The IPC bug is the important half. Quickshell marshals exactly five types
(string/int/bool/double/color) and maps a `var` return to VOID, discarding
the payload with no error -- src/io/ipc.cpp, "void and var get mixed by qml
engine". dock.*, shell.* and apps.* were all declared `: var`, so they
registered as `(): void` and returned nothing at all. The {ok, reason}
contract has never once reached a caller. All of them now return JSON as a
string, which is what actually crosses the socket.
Session: upstream fires `systemctl X || loginctl X` detached and throws the
exit code away. Fine on a desktop with someone at the keyboard, not fine on
a phone where the shell is the session manager and a verb that silently does
nothing leaves you believing the machine is suspending when it isn't. So:
probe loginctl/systemctl/hibernate once instead of assuming, run verbs
through a Process that logs the exit code, and refuse honestly when the
machine can't do the thing (the phone has no swap -- hibernate now says so
instead of no-opping). Every upstream verb keeps its name and call sites.
Inhibits carry a mandatory reason and get a cookie; state() lists who is
holding the machine awake and why. "Why didn't it sleep" is now answerable.
unlock() is refused by design -- the lock is the credential gate, so no IPC
caller routes around the PIN pad.
Named sessionctl, not session: ii's SessionScreen already owns "session",
and quickshell drops duplicate targets silently rather than erroring.
Idle: drop the 2>/dev/null and run hypridle through a Process, so a unit
that fails to come back is a log line instead of a flat battery.
Verified on the laptop: inhibit stops hypridle, uninhibit brings it back.
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