Added state fidelity#435

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ACE07-Sev wants to merge 3 commits intoTeamGraphix:masterfrom

ACE07-Sev:state-fidelity

Commits on Feb 15, 2026

- Added `graphix.sim.statevec.Statevec.fidelity` and `graphix.sim.statevec.Statevec.isclose` methods to calculate and check fidelity between two states.
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- Removed accidental assertion.
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Commits on Feb 16, 2026

resolved ruff and mypy issues
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