Hierarchical risk parity

Toolset pfopt_hrp: 1 tool.

Tool	What it does	Notes
`pfopt_hrp`	Hierarchical risk parity weights from a price (or returns) history, or from a covariance matrix alone: the assets are clustered by correlation distance, ordered along the tree and risk is split between sub-clusters by inverse variance, needing no expected returns and no matrix inversion.

Inputs, limits and outputs are described in Fincept Portfolio Optimizer. Full schemas: fincept_describe_tool.