chore: bump version to 2.3.0

Release includes:
- Deploy workflow for crates.io publishing via Trusted Publishers
- CHANGELOG.md documenting all releases
- CI improvements (clippy, coverage workflow)
- Code refactoring and test reorganization

Co-Authored-By: Claude <noreply@anthropic.com>

Author: doitian

AGENTS.md

@@ -141,11 +141,29 @@ The CI runs on Rust 1.76.0, stable, beta, and nightly. All must pass:
 To publish a new version to crates.io:
 
 1. Update the version in `Cargo.toml`
-2. Commit the version bump
-3. Create and push a tag: `git tag v<version> && git push origin v<version>`
-4. The deploy workflow will automatically publish to crates.io
-
-**Setup:** Uses crates.io Trusted Publishers (no API token required). Configure the trusted
+2. Update `CHANGELOG.md`:
+   - Move items from `[Unreleased]` to new version section
+   - Add release date in format `YYYY-MM-DD`
+   - Add comparison link at bottom of file
+   - Update `[Unreleased]` link to compare against new version
+3. Commit the version bump
+4. Create and push a tag: `git tag v<version> && git push origin v<version>`
+5. The deploy workflow will automatically publish to crates.io
+
+### CHANGELOG Format
+
+Follow [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) format:
+- **Added** for new features
+- **Changed** for changes in existing functionality
+- **Deprecated** for soon-to-be removed features
+- **Removed** for now removed features
+- **Fixed** for bug fixes
+- **Security** for vulnerability fixes
+- **Documentation** for doc-only changes
+
+### Trusted Publisher Setup
+
+Uses crates.io Trusted Publishers (no API token required). Configure the trusted
 publisher at https://crates.io/crates/fiber-sphinx/settings with:
 - Repository: `cryptape/fiber-sphinx`
 - Workflow: `deploy.yml`

CHANGELOG.md

@@ -7,12 +7,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.3.0] - 2026-02-02
+
 ### Added
 - Deploy workflow for automatic crates.io publishing on tag push
+- CHANGELOG.md documenting all releases
 
 ### Changed
 - Refactored code according to clippy warnings
 - Added clippy to CI pipeline
+- Added coverage workflow
 - Moved tests into a separate file
 
 ### Documentation
@@ -76,7 +80,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Hop shared secret derivation
 - Filler generation for packet construction
 
-[Unreleased]: https://github.com/cryptape/fiber-sphinx/compare/v2.2.0...HEAD
+[Unreleased]: https://github.com/cryptape/fiber-sphinx/compare/v2.3.0...HEAD
+[2.3.0]: https://github.com/cryptape/fiber-sphinx/compare/v2.2.0...v2.3.0
 [2.2.0]: https://github.com/cryptape/fiber-sphinx/compare/v2.1.0...v2.2.0
 [2.1.0]: https://github.com/cryptape/fiber-sphinx/compare/v2.0.0...v2.1.0
 [2.0.0]: https://github.com/cryptape/fiber-sphinx/compare/v1.0.1...v2.0.0