distro/yocto: add meta-salmanoff Yocto layer for QEMU x86 images

Vendor the BitBake layer (recipes, network config, boost pin, kernel
append, runqemu bridge script) alongside SMO for packaging as a Yocto image.

Co-authored-by: Cursor <cursoragent@cursor.com>

distro/yocto/meta-salmanoff/recipes-support/salmanoff-rusticl-env/salmanoff-rusticl-env.bb

@@ -0,0 +1,16 @@
+SUMMARY = "Enable Mesa Rusticl llvmpipe OpenCL device in login shells"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
+
+SRC_URI = "file://rusticl-llvmpipe.sh"
+
+S = "${UNPACKDIR}"
+
+inherit allarch
+
+do_install() {
+	install -d ${D}${sysconfdir}/profile.d
+	install -m 0644 ${UNPACKDIR}/rusticl-llvmpipe.sh ${D}${sysconfdir}/profile.d/
+}
+
+FILES:${PN} = "${sysconfdir}/profile.d/rusticl-llvmpipe.sh"

distro/yocto/meta-salmanoff/recipes-support/salmanoff-rusticl-env/salmanoff-rusticl-env/rusticl-llvmpipe.sh

@@ -0,0 +1,4 @@
+# Mesa Rusticl lists platforms but no devices until drivers are opted in at
+# runtime. llvmpipe uses the CPU as a software gallium OpenCL device (no GPU
+# or QEMU graphics device required).
+export RUSTICL_ENABLE=llvmpipe