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v0.0.1 - Reorganize ISO build tree, add docs/plans/scripts, and stage Phase 2 Slice B+C service integration artifacts

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Shared Alpine/musl static builder pattern

This directory defines the common static build base used by stack/* C99 binaries.

Why this exists

Per F30, every n-OS-tr C binary must be built in Alpine and statically linked against musl so ldd reports not a dynamic executable.

Dockerfile.alpine-musl: shared Alpine 3.19 base with common musl/static build dependencies.
build_static.sh: generic wrapper that:
- accepts <target-dir>
- picks linux/amd64 or linux/arm64 using uname -m (or ARCH=arm64 override)
- builds the shared base image and the target app image
- extracts the built binary to <target-dir>/build/<basename>_static_<arch>

Each stack component keeps its own Dockerfile.alpine-musl and a thin wrapper script:

./stack/<component>/build_static.sh

The component wrapper calls this shared script as:

../build-common/build_static.sh .

from inside that component directory.