r36 build: add liburing-dev (b12x PLE loader compiles io_uring support at wheel-build time via pkg-config; without it ENGRAM disk mode hard-errors at boot)

docker-images/glm53-jovian-r27/locks/apt-packages.txt

@@ -35,7 +35,11 @@ unzip=6.0-28ubuntu4.1
 wget=1.21.4-1ubuntu4.1
 
 # --- Engram ngram table reads (DS4.1 r36: io_uring disk mode) ---
-# Their runtime.lock pins liburing 2.5 (2.5-1build1). Runtime-only (no
-# -dev): the r36 tree's Engram disk mode does io_uring reads of the model's
-# learned ngram tables.
+# Their runtime.lock pins liburing 2.5 (2.5-1build1). liburing2 = runtime
+# lib; liburing-dev = the b12x wheel build needs the headers + the
+# pkg-config probe (r36 b12x io_uring PLE loader). Without the headers the
+# wheel builds degraded and ENGRAM disk mode hard-errors at boot:
+# "io_uring PLE support is unavailable ... rebuild the b12x native loader"
+# (hit 09-13, first r36 serve).
 liburing2=2.5-1build1
+liburing-dev=2.5-1build1