Add production SciPy solve_ivp integration

[aliengineering-byte]

Summary

• add an optional, typed scipy.integrate.solve_ivp trajectory adapter while preserving the zero-dependency base and v0.1 step adapters
• add explicit exact/tolerance replay semantics, a practical Python API, genuine Lorenz and predator-prey controls, generated regressions, demo assets, and the upstream visibility draft
• expand Windows/Linux and Python 3.10/3.12/3.14 CI across core-only and SciPy-extra installations

Validation

• 81 tests passed with 86.37% branch coverage
• isolated base wheel: 46 passed, 3 optional skips; NumPy/SciPy absent
• isolated SciPy wheel: SciPy 1.18.0; generated regressions passed
• all 12 legacy/SciPy positive and negative example commands matched declared outcomes
• Ruff format/lint, strict mypy, Twine, package audit, links, lock, diff, and hygiene passed

No PyPI publication and no SciPy issue/discussion are part of this PR.