20260618

Manifest drives Android ABI list (per-minor android_abis) (#21)

Each `pythons.<short>` entry in manifest.json now carries an
`android_abis` array (64-bit first, `armeabi-v7a` trailing on 3.12 only —
PEP 738 dropped 32-bit Android from 3.13). The Android build step in
build-python-version.yml reads it via `jq` and loops
`package-for-dart.sh` once per ABI, replacing the hardcoded
`if version_int < 313 then armeabi-v7a` shell check.

Adding or bumping a Python minor's ABI set is now a one-line manifest
edit; the workflow + downstream consumers (serious_python's
gen_version_tables, flet's manifest-driven registry) flow it through
automatically.

README schema note + the `android_abis` line added to the example.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>