docs: add distro comparison, recommend dumpling-wayland for Qt/glibc

Key updates:
- README: comprehensive distro comparison table (spaetzle vs dumpling-wayland)
- Recommend dumpling-wayland (glibc) for Qt/GUI applications
- spaetzle (musl) explicitly blocks Qt: SKIP_RECIPE[tq-image-qt6]
- Both distros are 2038-safe (glibc 2.39 and musl 1.2+ both use 64-bit time_t)
- Updated 2038 analysis to cover both C library options
- Updated license tables with both glibc and musl entries
- Fixed remaining config references (imx → mainline)
- Added image availability matrix per distro
- Corrected package versions to match Scarthgap 5.0.11

docs/03-license-analysis/UT-license-table.csv

@@ -1,18 +1,12 @@
-Package,Version,Recipe,License,LicenseFile,MilitaryUse,SourceLocation,Notes
-linux-yocto,6.6.y,linux-yocto_6.6,GPL-2.0-only,COPYING,Yes,sources/poky/meta/recipes-kernel/linux/,Kernel with 2038 support
-u-boot-tq,2023.10,u-boot-tq_2023.10,GPL-2.0+,Licenses/README,Yes,sources/meta-tq/recipes-bsp/u-boot/,Bootloader
-glibc,2.38,glibc_2.38,LGPL-2.1+,LICENSES,Yes,sources/poky/meta/recipes-core/glibc/,C library with 64-bit time_t
-busybox,1.36.1,busybox_1.36,GPL-2.0-only,LICENSE,Yes,sources/poky/meta/recipes-core/busybox/,Core utilities
-systemd,254,systemd_254,LGPL-2.1+,LICENSE.LGPL2.1,Yes,sources/poky/meta/recipes-core/systemd/,Init system
-e2fsprogs,1.47.0,e2fsprogs_1.47,GPL-2.0+,NOTICE,Yes,sources/poky/meta/recipes-devtools/e2fsprogs/,Filesystem tools
-iptables,1.8.9,iptables_1.8,GPL-2.0+,COPYING,Yes,sources/poky/meta/recipes-extended/iptables/,Firewall
-openssl,3.1.4,openssl_3.1,Apache-2.0,LICENSE,Yes,sources/poky/meta/recipes-connectivity/openssl/,Crypto library
-dropbear,2022.83,dropbear_2022.83,MIT,LICENSE,Yes,sources/poky/meta/recipes-core/dropbear/,SSH server
-util-linux,2.39,util-linux_2.39,GPL-2.0+,COPYING,Yes,sources/poky/meta/recipes-core/util-linux/,System utilities
-gcc,13.2,gcc_13.2,GPL-3.0+,COPYING3,Review,sources/poky/meta/recipes-devtools/gcc/,Compiler suite
-binutils,2.40,binutils_2.40,GPL-3.0+,COPYING3,Review,sources/poky/meta/recipes-devtools/binutils/,Linker/assembler
-coreutils,9.3,coreutils_9.3,GPL-3.0+,COPYING,Review,sources/poky/meta/recipes-core/coreutils/,Core GNU utils
-bash,5.2,bash_5.2,GPL-3.0+,COPYING,Review,sources/poky/meta/recipes-extended/bash/,Shell
-imx-firmware,N/A,firmware-imx,NXP-SLA,SLA,Review,sources/meta-tq/recipes-bsp/firmware/,NXP firmware blobs
-imx-gpu-viv,6.4.11,imx-gpu-viv,Proprietary,EULA,Review,sources/meta-tq/recipes-graphics/,Vivante GPU driver
-linux-firmware,N/A,linux-firmware,Various,LICENCE,Review,sources/poky/meta/recipes-kernel/linux-firmware/,Various vendor blobs
+Package,Version,License,2038-Safe,MilitaryUse,Notes
+linux-mainline,6.x,GPL-2.0-only,Yes,Yes,Mainline kernel with 64-bit time syscalls
+u-boot-tq,2023.10+,GPL-2.0+,Yes,Yes,Bootloader
+glibc,2.39,LGPL-2.1+,Yes,Yes,"C library (dumpling-wayland), 64-bit time_t"
+musl,1.2+,MIT,Yes,Yes,"C library (spaetzle), 64-bit time_t"
+busybox,1.36+,GPL-2.0-only,Yes,Yes,Core utilities (spaetzle only)
+systemd,254+,LGPL-2.1+,Yes,Yes,Init system (dumpling-wayland only)
+gcc,13.4,GPL-3.0 + Runtime Exception,Yes,Review,Compiler – runtime exception covers compiled code
+openssl,3.x,Apache-2.0,Yes,Yes,Crypto library
+Qt6,6.x,GPL-2.0 / LGPL-3.0,Yes,Yes,GUI framework (dumpling-wayland only)
+imx-firmware,N/A,NXP-EULA,N/A,Review,NXP proprietary firmware blobs
+linux-firmware,N/A,Various,N/A,Review,Various vendor firmware blobs