chore: sync all pending changes — kirigami platform headers, cookbook fix, docs, patches

Kirigami: remove stub .cpp, add Qt platform integration headers for
QML gate. Matches KDE src/pattern for direct header-only builds.

Cookbook: add --no-backup-if-mismatch to patch invocation (fetch.rs).

Kernel: consolidate patch chain, add debug-scheme-serial-fix.

Docs: archive old audit reports, add CHANGELOG and hardware validation
matrix. Update AGENTS.md with Linux reference source policy.

Scripts: add test-network-qemu.sh, test-storage-qemu.sh.

.gitignore: add local/reference/ exclusion.

recipes/core/kernel/kernel/recipe.toml

@@ -0,0 +1,11 @@
+[source]
+git = "https://gitlab.redox-os.org/redox-os/kernel.git"
+patches = ["redox.patch", "P0-canary.patch", "P1-memory-map-overflow.patch", "../../../local/patches/kernel/P4-supplementary-groups.patch"]
+
+[build]
+template = "custom"
+script = """
+make -f ${COOKBOOK_SOURCE}/Makefile
+mkdir -pv "${COOKBOOK_STAGE}/usr/lib/boot"
+cp -v kernel "${COOKBOOK_STAGE}/usr/lib/boot"
+"""