test(ci): prove declared Python 3.10 minimum runtime

[seonghobae]

Fail-first slice for #623

Protected main at branch creation: 56967deceafeb7ecd0ff08a98f196282a6ec81a3.

The package advertises requires-python = ">=3.10", while the accepted full-suite CI matrix currently exercises only CPython 3.12 and 3.14. This Draft adds only the smallest intentional RED proving the declared minimum runtime must execute the same Rust-primary full suite rather than remain metadata-only support.

tests/test_ci_python_310_contract.py requires the existing python-matrix job to contain 3.10, 3.12, and 3.14, retain fail-slow execution, install the same hash-locked CI dependencies, build/verify the compiled Rust-primary package, and run full pytest. Current protected main is expected to fail only the new matrix-membership assertion. Setup/import/fixture/dependency installation failure is not valid RED for this first commit.

After exact-head CI proves that source boundary, implement the smallest workflow change by adding CPython 3.10 to the existing matrix. Then let real CI determine whether the current hash-locked dependencies and code genuinely support 3.10. If the 3.10 lane exposes a real dependency/syntax/API incompatibility, fix the root cause without dropping hashes, skipping tests, xfail-ing compatibility, or narrowing the suite; narrow package metadata only through a separate evidence-backed compatibility decision if support is genuinely not intended/feasible.

Preserve Python 3.12/3.14, the aggregate required python check, Rust/PyO3/default-Rust verification, package/reinstall, GPU, fuzz, Security/SAST and immutable action pins. Add authoritative changelog/support-documentation updates only after GREEN. No psychometric numerical semantics, provider/dependency version bump, release, or canonical #604 documentation branch belongs here.

Keep Draft through RED→GREEN and current-head review/gates. Advances #623.

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[seonghobae]

Superseded by requires-python >=3.12 floor (#703 restored via #713). Declared minimum is no longer 3.10.