chore(dllm): review fixes - file modes and build-matrix doc accuracy

Drop the stray executable bit from the Go sources and Makefile (the
sibling Go backends commit them 644; only run.sh/package.sh are
executable), and correct two documentation claims found in the final
branch review: cuda13-dllm is built for amd64 only (arm64 CUDA ships as
the l4t flavor), and package.sh is the parakeet-cpp-style stub layout
with no ldd walk.

Assisted-by: Claude Code (Fable 5)
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
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