--shellenv emits an eval-able export of the Dart SDK bin and the emb shim
dir, so eval "$(./bootstrap.sh --shellenv)" fetches Dart, activates emb,
and puts both on PATH in one line. The default clean-stdout bin-dir output
is unchanged.
Signed-off-by: Joel Winarske <joel.winarske@gmail.com>
Add `tool/bootstrap_dart.py` (stdlib-only Python 3.6+) to fetch, SHA-256
verify, and cache the official Dart SDK across Linux distros, macOS, and
Windows -- no package manager or root required. Content-addressed cache with
atomic publish; restores exec bits and symlinks that `zipfile` would drop.
`--activate <dir>` chains into `dart pub global activate` so emb installs in
one OS-agnostic step.
Add `bootstrap.sh`, a thin POSIX wrapper that runs the script with
`--activate .` for Linux/macOS. Ignore `__pycache__`.
Signed-off-by: Joel Winarske <joel.winarske@gmail.com>