feat(portfolio): Read data and calculate mean-variance for returns#81

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SaurabhJamadagni wants to merge 3 commits intocarlobortolan:masterfrom

SaurabhJamadagni:portfolio_optimization

Commits on Sep 15, 2025

Commits on Oct 15, 2025

Merge branch 'master' of https://github.com/carlobortolan/quantrs into portfolio_optimization
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