chore: initial release v0.1.0

Runtime-agnostic oneshot broadcast channel for Rust.

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+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).
+
+## [Unreleased]
+
+## [0.1.0] - 2025-01-XX
+
+Initial release.
+
+### Features
+- Runtime-agnostic oneshot broadcast channel for Rust
+- Single announcer can broadcast to multiple listeners
+- Works with tokio, async-std, smol, or any async runtime
+- Blocking and async APIs for maximum flexibility
+- Type-safe: can only announce once, enforced at compile time
+- Cancel-safe async operations
+- Efficient: O(1) memory with Arc-based value sharing
+- Feature flags: `std` (default), `tracing` (optional)
+
+### Quality Assurance
+- Comprehensive test suite: 625+ tests covering all scenarios
+- Property-based testing with 1024 test cases per property
+- Mutation testing to verify test quality
+- Fuzz testing for edge cases and memory safety
+- 98%+ code coverage
+- Extensive benchmarks for performance validation
+
+[Unreleased]: https://github.com/swaits/announcement/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/swaits/announcement/releases/tag/v0.1.0