A shell that exits under a run answers exit N, and the log says exit before del

A dogfood agent ran `exit 3` through pty/run: the reader got ENOENT, and
the log went straight to del. The hosts now read a shell's exit status at
its pty's end as they do a command's; a run waiting on the line answers
`exit 3` with what it printed, the log says `exit <serial> 3` before
the pane's `del`, and an open run still stats after its pane is gone
(cat fstats its input). Pins cloud9 f35b7ed, whose stat of an open fid names
its open. Writes to a gone pane's pty/data, held open or not, fail ENOENT.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 9 insertions, 9 deletions

diff --git a/src/macos.zig b/src/macos.zig
index b180d7ba..a2175f3d 100644
--- a/src/macos.zig
+++ b/src/macos.zig
@@ -1313,15 +1313,15 @@ fn drainInbox(st: *State) bool {
                         host_io.commandEof(st.core, &st.ptys, e.pane, st, closeWatched);
                         continue;
                     }
-                    // Unwatched, a command's exit is read here, as its end.
-                    if (st.core.panes[e.pane]) |pane| if (pane.command != null) {
-                        const status = host_io.exitStatus(pt.pid, 100);
-                        if (status != null) pt.pid = 0; // reaped: no shell to retire
-                        reap(st, e.pane);
-                        st.core.update(.{ .exited = .{ .pane = e.pane, .status = status } });
-                        st.core.update(.{ .eof = .{ .pane = e.pane } });
-                        continue;
-                    };
+                    // Unwatched, a command's exit is read here, as its end,
+                    // and a shell's, for a run waiting on it and the log.
+                    const command = if (st.core.panes[e.pane]) |pane| pane.command != null else false;
+                    const status = host_io.exitStatus(pt.pid, 100);
+                    if (status != null) pt.pid = 0; // reaped: no shell to retire
+                    reap(st, e.pane);
+                    if (command or status != null) st.core.update(.{ .exited = .{ .pane = e.pane, .status = status } });
+                    st.core.update(.{ .eof = .{ .pane = e.pane } });
+                    continue;
                 }
                 reap(st, e.pane);
                 st.core.update(.{ .eof = .{ .pane = e.pane } });