Take the catalogue's composition rules into the node-engine

ADR 0593 §7: the composer with its refusals leaves mesh-sdk, so mesh-sdk
carries no composition rule. The catalogue functions only the
node-engine's composition reaches (Resolve, Resolution's Compose,
Declaration, DataItems, LeftOut, Rules and the rest, the settings,
placeholder and template refusals, the rendering helpers) are copied
with their tests into internal/compose/resolution; a method of a
mesh-sdk shape becomes a function taking it first. The composition
calls its own copies, and the captured catalogue its tests read lives
here now, shared by mesh-compose's tests.

Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL

testdata/beside/mesh-catalog/modules/clipmenu/files/systemd/clipmenud-mesh.conf

@@ -0,0 +1,14 @@
+# clipmenud in the operator's account (module clipmenu, novox/hq ADR 0208). Owned by the mesh: replaced at every push.
+# The package's unit starts clipmenud with no DISPLAY; the module's launcher finds the display and puts the
+# text-only xsel first on the PATH. The settings repeat the module's environment, which the account's
+# service manager does not read.
+[Unit]
+StartLimitIntervalSec=0
+
+[Service]
+RestartSec=2s
+Environment=CM_SELECTIONS=clipboard
+Environment=CM_MAX_CLIPS=500
+Environment=CM_HISTLENGTH=15
+ExecStart=
+ExecStart=/usr/local/lib/mesh-clipmenu/clipmenud-session