A column has a ctl, an exec and an rmdir over 9P, and Restore maps its serial

A script could read and write a column's tag but not act on the column.
col/<serial>/ctl takes Delcol, Joincol, New and Tty, each acting on that
column as from its tag; col/<serial>/exec runs a word as a middle click in
the tag; rmdir col/<serial> closes an empty column and refuses one with
panes (ENOTEMPTY, an err record saying why). The root ctl's refusal of
Delcol and Joincol points at col/<serial>/ctl. A dump keeps each column's
serial and Restore logs restoredcol <old> <new>; the dump golden gains
them. Documented: Joincol's survivor, the column on the right, keeps its
serial and tag.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/.agents/skills/pardes-9p/SKILL.md b/.agents/skills/pardes-9p/SKILL.md
index 8c383962..844e028f 100644
--- a/.agents/skills/pardes-9p/SKILL.md
+++ b/.agents/skills/pardes-9p/SKILL.md
@@ -84,6 +84,8 @@ $m/ctl        the settings, one a line as a write takes them; write a setting or
 $m/commands   every builtin: `Word`, `Word arg`, then `root` or `pane` (which ctl takes it)
 $m/layout     one line per column: serial index x width current|notcurrent empty|full pane-serials...; active <serial>
 $m/tag        the workspace tag (> replaces, >> appends, one line); $m/col/<serial>/tag a column's (serials stay, as panes' do)
+$m/col/<serial>/ctl  Delcol, Joincol, New, Tty on that column; col/<serial>/exec a word as a click in its tag;
+              rmdir col/<serial> closes an empty column
 $m/pane/new   open it to make a pane (a scratch named <dir>/+New), read names it; it goes in
               the ACTIVE column (the one last typed or clicked in, or Newcol's), filling it if
               empty, else taking the bottom half of its last pane (ctl `Placement pardes`: the old rules);