squashfs: ignore 'discard' mount option

[greatgitsby]

AGNOS's fstab mounts /persist with discard, which newer kernels reject, failing persist.mount and dropping the device into systemd maintenance mode. Accept and ignore the flag in squashfs so the legacy fstab boots unmodified. Needed by the WiFi bringup PR (#124) but useful on its own.

[github-actions]

vamOS System Profile

Changes vs master

Metric	Change
Used space	3437.5MB → 3437.5MB (+0MB)
Sparse image	3391.9MB → 3392.3MB (+.3MB)
Package count	524 → 524

Directory size changes (>1MB)

Directory	Change

---

Metric	Value
Used space	3437.5MB / 5959.5MB
Files	56143
Directories	4762
Symlinks	3589
Packages	524

Top 10 Directories

Directory	Size

Category Breakdown

Category	Size	%
xbps packages	2502.8MB	72.8%
Python venv	591.7MB	17.2%
Firmware	11.5MB	.3%
Other	331.3MB	9.6%

Top 10 Packages by Size

Package	Size
mit-krb5-libs-1.21.3_1	270.4MB
gawk-5.3.2_1	210.3MB
llvm-21_3	148.6MB
libldns-1.9.2_1	124.3MB
pd-mapper-1.0_1	73.9MB
libclang21-21.1.7_1	70.2MB
glib-2.88.0_1	67.4MB
gcc-14.2.1+20250405_4	66.6MB
libcap-progs-2.78_1	56MB
cmake-4.2.2_2	53.2MB

Top 30 Files by Size

File	Size
/usr/lib/llvm/21/lib/libLLVM.so.21.1	124.3MB
/usr/lib/llvm/21/lib/libMLIR.so.21.1	89.7MB
/usr/lib/llvm/21/bin/mlir-transform-opt	82.9MB
/usr/lib/llvm/21/lib/libclang-cpp.so.21.1	56MB
/usr/lib/llvm/21/bin/mlir-translate	53.2MB
/usr/bin/uv	52.6MB
/usr/lib/llvm/21/bin/llvm-exegesis	52MB
/usr/lib/llvm/21/bin/llvm-bolt-binary-analysis	50.6MB
/usr/lib/gcc/aarch64-linux-gnu/14.2/gnat1	40.1MB
/usr/bin/gdb	39.1MB
/usr/lib/libgallium-26.1.3.so	37.7MB
/usr/lib/gcc/aarch64-linux-gnu/14.2/cc1plus	37.3MB
/usr/lib/libllvm-qcom.so	35.2MB
/usr/lib/gcc/aarch64-linux-gnu/14.2/cc1	35.2MB
/usr/lib/libRusticlOpenCL.so.1.0.0	34.3MB
/usr/lib/gcc/aarch64-linux-gnu/14.2/lto1	33.9MB
/usr/bin/lto-dump	33.9MB
/usr/local/venv/bin/ruff	31.8MB
/usr/share/icu/78.3/icudt78l.dat	31.5MB
/usr/lib/llvm/21/lib/libclang.so.21.1.7	30.2MB
/usr/lib/llvm/21/bin/c-index-test	28.6MB
/usr/local/venv/lib/python3.12/site-packages/gcc_arm_none_eabi/toolchain/libexec/gcc/arm-none-eabi/13.2.1/cc1	28.2MB
/usr/lib/libz3.so	27.9MB
/usr/bin/run	26.7MB
/usr/local/venv/lib/python3.12/site-packages/numpy.libs/libscipy_openblas64_-71e1b124.so	23.6MB
/usr/comma/updater	23.5MB
/usr/comma/setup	23.5MB
/usr/comma/reset	23.5MB
/usr/local/uv/python/cpython-3.12.13-linux-aarch64-gnu/bin/python3.12	22.2MB
/usr/local/uv/python/cpython-3.12.13-linux-aarch64-gnu/lib/libpython3.12.so.1.0	22.1MB