Migrate Weibull distribution to per-type S3 interface

[sbfnk-bot]

Description

This PR closes part of #41: it migrates the Weibull distribution to the per-distribution S3 interface, continuing the refactor already landed for Gamma(), Normal(), LogNormal() and Exp().

R/weibull.R now holds natural_params.weibull, lower_bounds.weibull, dist_cdf.weibull, mean.weibull and sd.weibull, and the five weibull switch() arms in dist_spec.R delegate to these via new_dist("weibull"). Behaviour is unchanged: mean scale * Γ(1 + 1/shape), sd scale * sqrt(Γ(1 + 2/shape) − Γ(1 + 1/shape)²), CDF pweibull, natural parameters shape/scale.

Initial submission checklist

• My PR is based on a package issue and I have explicitly linked it.
• I have tested my changes locally (all 36 tests pass).
• I have added or updated unit tests where necessary.
• I have updated the documentation if required and rebuilt docs if yes.
• I have followed the established coding standards (checked with lintr).
• I have added a news item linked to this PR.

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📥 Commits

Reviewing files that changed from the base of the PR and between 6b94414 and aef6d07.

📒 Files selected for processing (4)

• NAMESPACE
• NEWS.md
• R/dist_spec.R
• R/weibull.R

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch migrate-weibull

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