Build the full dependency wheel set for bionic from sdist inside the
digest-pinned termux-docker container, using the STAGED payload python
(so the ABI matches the shipped interpreter by construction). Native
sdists (rust/clang) compile serially against the container toolchain;
wheels land in a payload wheelhouse that later gates an offline,
marker-intact venv install. A cache-hit fast path (index.json verified
sha-by-sha) skips the whole container phase when the restored wheelhouse
is already the proven graph.
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