pty/run answers with the command's output; pin cloud9 with 9ns concurrency and E.BUSY

The answer is now the header line (exit N, or exit N cut M when only the
last 64 KiB were kept, or exit N cut when its start scrolled out of the
history), then what the command printed: the screen text between its C and
D marks, which the marks handler pins so scrolling keeps them.

Also from review: a plain /log open honours its offset until follow is
written, so tail -n and less work; whitespace-only run lines are refused.

cloud9 is pinned at 82d8152c: 9ns keeps up to 32 requests in flight per
mount so a waiting read no longer freezes the rest of it, and E.BUSY
replaces the errno pardes spelled locally.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/src/fs.zig b/src/fs.zig
index c35322b6..8e2c52a1 100644
--- a/src/fs.zig
+++ b/src/fs.zig
@@ -1262,6 +1262,7 @@ pub const Namespace = struct {
         for (st.os_paths.items) |entry| gpa.free(entry.path);
         st.os_paths.deinit(gpa);
         for (st.snapshots) |snapshot| if (snapshot.bytes) |bytes| gpa.free(bytes);
+        for (&st.runs) |*slot| slot.reset(gpa, 0);
         for (&st.panes) |*pf| pf.deinit(gpa);
         st.log.deinit(gpa);
         st.out.deinit(gpa);