Keep a pane's filesystem state on the Pane instead of a slot-indexed table

addr, limit, the event queue and its readers, pty/data's queue, a waiting
run and the /log announcement flag lived in p.fs.panes[slot], reset when
the pane went; a reused slot is how the bug class came in. acme keeps the
same state on its Window (editors/acme/dat.h:226-266), so now Pane.fs
holds it: announced, retired (noteRetire, which still answers a waiting
run and drops the listener count first) and freed with the pane itself.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/test/fs_bench.zig b/test/fs_bench.zig
index 74b7b5da..00601ca3 100644
--- a/test/fs_bench.zig
+++ b/test/fs_bench.zig
@@ -285,7 +285,7 @@ pub fn main(init: std.process.Init) !void {
         const initial_bytes = pane.file.?.content.len;
         key_body_bytes = initial_bytes;
         if (scripted) {
-            keys.core.fs.panes[keys.file_id].readers = 1;
+            keys.core.panes[keys.file_id].?.fs.readers = 1;
             keys.core.fs.listeners = 1;
         }
         counting.allocations = 0;
@@ -297,7 +297,7 @@ pub fn main(init: std.process.Init) !void {
         const elapsed = nowNs() - start;
         if (pane.file.?.content.len != initial_bytes + key_reps or pane.cur_col != key_reps or
             !std.mem.allEqual(u8, pane.file.?.content[0..key_reps], 'x')) return error.MissingKeystroke;
-        const events = &keys.core.fs.panes[keys.file_id].events;
+        const events = &keys.core.panes[keys.file_id].?.fs.events;
         if (scripted) for (0..key_reps) |i| {
             var buf: [64]u8 = undefined;
             const expected = try std.fmt.bufPrint(&buf, "KI{d} {d} 0 1 x\n", .{ i, i + 1 });