The docs: the one rule covers pty/ctl exec, misses and gone directories are ENOENT, #100,#50 past the end, --detach forks

The one rule's wording left out a pane's pty/ctl and the ENOENT a Find,
Grep or missing directory now answers; `#100,#50` in a short text says out
of range, its ends checked first; and the skill now says --detach forks,
the pid being /status's.

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

1 files changed, 7 insertions, 4 deletions

diff --git a/.agents/skills/pardes-9p/SKILL.md b/.agents/skills/pardes-9p/SKILL.md
index d89a3ac3..5ac1ba46 100644
--- a/.agents/skills/pardes-9p/SKILL.md
+++ b/.agents/skills/pardes-9p/SKILL.md
@@ -17,7 +17,9 @@ Check `$NINE_MOUNT` first. `9ns --mntgen` sets it for every process it starts
 (an interactive shell on this machine runs inside one), so a set `$NINE_MOUNT`
 means the posted-9P registry is mounted there, usually `/mnt/9p`, and each
 running editor is a directory `$NINE_MOUNT/pardes/<pid>/` (a `--detach=NAME`
-session's is `pardes/NAME/`). Inside a pane, `$PARDES_9P` is that session's
+session's is `pardes/NAME/`; `pardes --detach=NAME` forks, its parent
+returning at once, so the running editor's pid is not `$!`: read it from
+`$m/status`, whose first line is `pid <n>`). Inside a pane, `$PARDES_9P` is that session's
 socket (`/run/user/1000/pardes-9p-<pid or NAME>.sock`), which names the
 directory either way, and `$PARDES_PANE` is the calling pane's serial:
 
@@ -162,9 +164,10 @@ it again. Each command line runs once whole, however a mount cuts a big write; a
 line with no newline runs when the open closes, and an Edit block still open
 then fails there (an `err`: ``unmatched `{'``, or an a/c/i text with no `.`
 line), changing nothing. One rule: a builtin that fails, whether through a
-ctl, look, exec, tagexec or a column's exec, fails the write (EINVAL for a
-malformed line, else EIO or an errno that fits) and logs one `err` with the
-reason, no `msg`. A look that finds nothing is no failure: it answers
+ctl (a pane's pty/ctl `exec` too), look, exec, tagexec or a column's exec,
+fails the write (EINVAL for a malformed line, ENOENT for what is not there --
+a directory gone, a Find or Grep with no hit -- else EIO or an errno that
+fits) and logs one `err` with the reason, no `msg`. A look that finds nothing is no failure: it answers
 nothing and logs one `err`. A command line run in a command pane is judged
 by its `exit` record. A word no builtin
 knows (a typo included) is a command line: written at a terminal at its