Re-declare scipy as a direct dependency

[AlexanderFengler]

• Re-adds scipy>=1.10 to [project.dependencies], dropped in Fixed numpy version #1137.
• scipy is a direct import in shipped source, not a transitive dependency:
  • src/hssm/plotting/predictive.py:13 — from scipy.stats import gaussian_kde
  • src/hssm/plotting/quantile_probability.py:14 — from scipy.stats import chi2
• Today it arrives only via pymc. If pymc ever drops or re-scopes its scipy requirement, hssm.plotting breaks at import with no constraint to protect it — the same undeclared-direct-import fragility behind the numpy 2.5 row_stack CI breakage (drift: numpy 2.5 broke the fast suite on fresh resolves (row_stack removed) #1144).

Why this is not the #1145 objection

#1145 was rightly closed for declaring versions of transitive dependencies, which transfers version-management burden to us for packages we never import. That objection does not apply here: scipy is imported directly by code we ship, so declaring it is standard packaging practice (PEP 508 — declare what you import). The floor is deliberately loose (>=1.10, resolving to 1.18.0 today) so it constrains nothing in practice; it only guarantees scipy is present.

Verification

• uv lock — no lockfile change; scipy already resolved at a satisfying version.
• uv run prek run --all-files — ruff check/format and all file hooks pass. The mypy and pyrefly hooks fail identically on unmodified main (14 pre-existing errors in tests/rl/test_rlssm.py and tests/addm/oracle/validation.py); unrelated to this change.
• from scipy.stats import gaussian_kde, chi2 and both hssm.plotting modules import cleanly (scipy 1.18.0).

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch restore-scipy-direct-dependency

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