Adds a `rust-arm64` job: clippy -D warnings for the client crates at
--target aarch64-unknown-linux-gnu, plus a --no-default-features session
build so the minimal embedded configuration keeps compiling in its own
right rather than only as a subset of the default one. Runs in the cross
image on the ordinary amd64 runner; client crates are listed explicitly
because --workspace would drag in the x86-only host encode stack.
This is a regression guard, not an artifact leg (deb.yml ships those).
c_char signedness cuts both ways and neither direction is visible from an
x86-only CI: hardcoding i8 fails to COMPILE on ARM, while casting to u8
fails the LINT on ARM. Two such defects were already found this way.
Also documents the arm64 client .deb recipe in packaging/debian/README.md.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
enricobuehlerandClaude Opus 5
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