add propensity to imports and handle importing namespace

[malcolmbarrett]

No description provided.

[Copilot]

Pull Request Overview

This PR adds propensity to the package imports and improves handling of propensity score weighting (psw) objects by loading the propensity namespace automatically and replacing workarounds with proper API calls.

• Added propensity to package imports in DESCRIPTION
• Added namespace loading in .onLoad() to ensure psw S3 methods are available
• Replaced inherits(x, "psw") checks with propensity::is_psw() calls
• Removed vctrs::vec_data() workarounds that were previously needed for psw objects

Reviewed Changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
DESCRIPTION	Added propensity to package imports
R/zzz.R	Added .onLoad function to load propensity namespace
R/utils-validation.R	Updated psw object validation to use propensity::is_psw()
R/geom_roc.R	Removed vctrs::vec_data() workaround from examples
R/geom_qq2.R	Removed vctrs::vec_data() workaround from examples
man/geom_roc.Rd	Updated documentation examples
man/geom_qq2.Rd	Updated documentation examples
tests/testthat/test-extract_weight_data.R	Updated test to use propensity::is_psw()
tests/testthat/test-compute_balance.R	Updated tests to use propensity::is_psw()
tests/testthat/test-geom_roc.R	Removed vctrs::vec_data() workaround
tests/testthat/test-geom_qq2.R	Removed vctrs::vec_data() workaround