chore: release v0.3.0

Author: github-actions[bot]

CHANGELOG.md

@@ -6,3 +6,95 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 <!-- changelog-insert-here -->
+
+## [0.3.0] - 2026-03-22
+
+### Added
+- 100% test coverage for all Rust code (67 tests total)
+- Comprehensive unit tests for all traits: `Num`, `SignNum`, `ToSigned`, `MaxValue`, `LinkType`
+- Edge case tests for unsigned to signed conversion (wrapping behavior)
+- Integration tests for combined trait usage
+- CI/CD pipeline with GitHub Actions for automated testing, linting, and releases
+- Code coverage reporting with cargo-llvm-cov
+- Changelog fragment system for automated version management
+- Contributing guidelines with development workflow documentation
+- Pre-commit hooks configuration for code quality checks
+
+### Changed
+- Migrated from nightly Rust (nightly-2022-08-22) to stable Rust toolchain
+- Updated Rust edition from 2018 to 2021
+- Updated `num-traits` dependency from 0.2.14 to 0.2.19
+- Set minimum Rust version (MSRV) to 1.70
+
+### Removed
+- **BREAKING**: Removed `Step` trait bound from `LinkType` trait
+  - The `std::iter::Step` trait remains unstable in Rust (tracking issue #42168)
+  - Types implementing `LinkType` no longer need to implement `Step`
+  - This is required for stable Rust compatibility
+- Removed `#![feature(step_trait)]` and `#![feature(trait_alias)]` feature flags
+
+### Fixed
+
+- Corrected license declaration in `rust/Cargo.toml` from `LGPL-3.0` to `Unlicense` (public domain)
+- Updated license description in `CONTRIBUTING.md` from `LGPL-3.0` to `Unlicense (public domain)`
+
+### Changed
+
+- Added Unlicense badge to all README files (root, Rust, C#, C++)
+- Added License section to all README files explaining the Unlicense and its advantages over LGPL
+
+### Fixed
+- Added missing `cargo publish` step to CI/CD pipeline, fixing issue where releases
+  were created on GitHub but never published to crates.io (#127)
+- Fixed deprecated `::set-output` command in `version-and-commit.mjs`
+- Added `RUSTFLAGS: -Dwarnings` to CI/CD pipeline for stricter compilation checks
+
+### Changed
+
+- Migrated all CI/CD pipeline scripts from Node.js (.mjs) to Rust (.rs) using rust-script
+- Updated workflow to use rust-script for all script execution, eliminating Node.js dependency
+
+### Added
+
+- Smart change detection job (`detect-code-changes.rs`) to skip unnecessary CI jobs
+- Version modification check to prevent manual version edits in PRs
+- Crates.io-based release check instead of git tag check (`check-release-needed.rs`)
+- Graceful crates.io publish script with auth error handling (`publish-crate.rs`)
+- Clippy lint check in CI pipeline
+- Doc tests (`cargo test --doc`) in CI pipeline
+- Package verification (`cargo package --list`) in CI build
+- PR-diff-aware changelog fragment validation (`check-changelog-fragment.rs`)
+- Changelog PR release mode for manual release workflow
+- Multi-language repository path detection utility (`rust-paths.rs`)
+- Case study documentation for issue #132
+
+### Fixed
+
+- CI/CD "Auto Release" failure caused by hard-failing on missing `CARGO_REGISTRY_TOKEN`
+- Job dependency conditions now use `always() && !cancelled()` pattern for correct behavior
+
+### Added
+
+- Rust-specific README.md with detailed description,
+  usage examples, and crate badges
+- C# language-specific README.md with namespace docs,
+  installation, and usage examples
+- C++ language-specific README.md with Conan
+  installation and usage info
+
+### Changed
+
+- Root README.md now uses a badge table for all
+  language versions (C#, C++, Rust)
+- Replaced Gitpod badge with GitHub Codespaces badge
+- Updated Cargo.toml readme field to point to
+  Rust-specific README.md
+
+### Fixed
+
+- Rust crate on crates.io was displaying generic root
+  README instead of Rust-specific documentation
+
+### Fixed
+
+- Removed unused `std::process::exit` import from `scripts/get-bump-type.rs` that caused a compiler warning

rust/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "platform-num"
-version = "0.2.0"
+version = "0.3.0"
 edition = "2021"
 rust-version = "1.70"
 authors = ["uselesssgoddess", "Linksplatform Team <linksplatformtechnologies@gmail.com>"]