release: parallel command links, nine-level list nesting

Two development changes since the last snapshot.

perf(build): com/Makefile's recursive $(MAKE) commands inherited no
jobserver, so kdiag, kdesc and ktext linked one after another even though
they are independent links against the already-built library.  A clean
rebuild drops from 27.9 s to 23.1 s on an i9-14900KF and from 16.4 s to
13.8 s on an M5 Pro.

fix(list): LaTeX's built-in enumerate and itemize stop at four levels, so
a deeper @ol or @ul failed with "Too deeply nested".  sks/list/sty/list.sty
now redefines both through enumitem to allow nine, with explicit per-level
itemize markers, since \renewlist discards the built-in ones.

(from dev 15b822f06ee0)

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

README.md

@@ -41,7 +41,7 @@ are regenerated on each release — patches cannot be merged directly.
 Report problems (or send patches) to the author; accepted changes are
 applied to the development tree and appear in a following snapshot.
 
-This snapshot was assembled from development commit `43a4ce7dea2a`.
+This snapshot was assembled from development commit `15b822f06ee0`.
 
 ## License