fix 9P docs: s/new is r/w, fix ctl command list

help.md: s/new was listed as (w) but reading returns a KV template.
9p submodule: ctl comment listed 'compact, clear, interrupt' but
actual commands are stop, kill, rn, compact, clear.

9p

@@ -1 +1 @@
-Subproject commit 7d233619829dc26b5393bf29d00e05397940ee61
+Subproject commit 3cd2afc24cd64a07a8595718b402b771474c5c39

doc/help.md

@@ -23,7 +23,7 @@ ollie/
   p/              prompt templates (r/w)     ls, cat, edit
   pl/             plans (r/w)                ls, cat, edit
   s/              sessions                   ls
-    new           create session (w)         echo "cwd=/path" >
+    new           create session (r/w)       cat: KV template; echo "cwd=/path" >
     <id>/         session directory           rm -r to kill; mv to rename
       agent       active agent (r/w)
       backend     active backend (r/w)