Add constraints

[veitveit]

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[Copilot]

Pull request overview

This PR adds a constraints feature to the vsclust fuzzy c-means clustering algorithm, allowing users to fix certain membership values to zero. This enables excluding specific features from being assigned to particular clusters.

Key Changes:

• Added optional constraints parameter (logical matrix) to clustering functions that forces membership values to zero for constrained feature-cluster pairs
• Updated C++ implementation with constraint-aware versions of distance and membership update functions
• Added comprehensive test coverage for constraint functionality

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/vsclust_algo.cpp	Implements constraint logic in C++ fuzzy c-means algorithm with overloaded distance/membership functions
src/RcppExports.cpp	Updates exported C++ function signatures to include constraints parameter
R/RcppExports.R	Adds R wrapper handling for constraints with default empty matrix initialization
R/RunClustering.R	Adds constraints validation and integrates constraint parameter into clustering functions
R/WrapperFuncs.R	Propagates constraints parameter through wrapper functions and removes unnecessary clusterExport calls
tests/testthat/test-HelperFuncs.R	Adds test cases validating constraint behavior in both vsclust_algorithm and ClustComp
man/*.Rd	Updates documentation to describe constraints parameter and fixes existing typos
..Rcheck/00check.log	Build log showing R version update (informational only)

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