Update discussion links

Author: soareschen

content/blog/2025-07-07-extensible-datatypes-part-1.md

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+Discuss on [Reddit](https://www.reddit.com/r/rust/comments/1ltu9nl/programming_extensible_data_types_in_rust_with/), [Lobsters](https://lobste.rs/s/piugxk/programming_extensible_data_types_rust), [Hacker News](https://news.ycombinator.com/item?id=44497815), and [GitHub](https://github.com/orgs/contextgeneric/discussions/12).
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 # Overview
 
 I’m excited to announce the release of [**CGP v0.4.2**](https://github.com/contextgeneric/cgp/releases/tag/v0.4.2), a major milestone that significantly expands the expressive power of generic programming in Rust. With this release, CGP introduces full support for **extensible records and variants**, unlocking a range of new capabilities for developers working with highly modular and reusable code.