The document opened with dependency installation and buried "Run From
Source" between the build and release sections, so a newcomer met the
MSYS2 setup before learning what the stack was. Reorder it as stack and
tools, external libraries, run from source, build, release, CI, and add
a clickable two-level Contents block.
External libraries now list version, repository, and license type in one
table, and the package-* scripts are documented for the first time. The
Project Layout section is gone: it duplicated the package map in
ARCHITECTURE.md and had drifted out of date, missing
src/platform/filemanager.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
