Remove magrittr dependency and replace %>% with native pipe |>

[Copilot]

Summary

Since R ≥ 4.1.0 is already the minimum version, replace all magrittr %>% with native |> and drop magrittr from Suggests.

• DESCRIPTION: Remove magrittr from Suggests
• R source (distributions.R, utils.R): Update pipes in roxygen example and user-facing message
• Vignettes (5 files): %>% → |> throughout
• Dev/test scripts (.dev/, tests/internal/): Same replacement

Notable: in bmm_m3.Rmd, magrittr's . pronoun (.$data) replaced with explicit m3_fit$data since native pipe doesn't support dot forwarding.

Tests

[] Confirm that all tests passed
[] Confirm that devtools::check() produces no errors

Release notes

Remove magrittr as a suggested dependency. All pipe usage now uses R's native |> operator.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove magritte suggest and replace with native pipe everywhere</issue_title>
<issue_description>since we bump to R 4.1 in #339 we can now use the native pipe. Magrittr is a suggested dependency because we only use the pipes in vignettes, but we should remove it completely and replace with native pipe</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove magritte suggest and replace with native pipe everywhere #340

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