docs: add CHANGELOG.md backfilled from GitHub releases

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 1.1.0](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.3.0] - 2026-04-08
+
+Add streaming support.
+
+### Added
+
+- Claude settings and git workflow guidelines (#22)
+- `CLAUDE.md`, `settings.json`, and SessionStart hook (#24)
+- Coverage badge reflecting actual coverage (#32)
+- Project URLs for PyPI sidebar links (#34)
+- Real integration tests for nightly pipeline (#36)
+- `StreamReservation` context manager for streaming DX (#39)
+
+### Changed
+
+- Standardize `CLAUDE.md` and `settings.json`: fix typo, add schema, add gitignore entries (#23)
+- Refactor CI workflow to use shared workflow from `.github` repository (#25)
+- Analyze codebase metrics (#26)
+- Improve package metadata and discoverability (#33)
+- Bump `actions/upload-artifact` from 4 to 7 (#31)
+- Bump `actions/checkout` from 4 to 6 (#30)
+- Bump `actions/setup-python` from 5 to 6 (#29)
+- Bump `actions/download-artifact` from 4 to 8 (#28)
+
+### Fixed
+
+- Contract test UTF-8 encoding for Windows compatibility (#27)
+- API response codes and parameter names in integration tests (#37)
+- Guard `requests` import so CI collection doesn't fail (#38)
+
+## [0.2.0] - 2026-03-24
+
+Bug fixes, support for 0.1.24 spec, more tests.
+
+### Added
+
+- Comprehensive integration examples for Cycles Python client (#9)
+- API key creation instructions to README (#13)
+- Badges to README for PyPI, CI, and License (#15)
+- Documentation links to README (#16)
+- Documentation for nested `@cycles` decorator behavior and best practices (#17)
+- Budget state and extension error codes, charged amount to response (#20)
+
+### Changed
+
+- Raise test coverage threshold from unconfigured to 95% (#10)
+- Move coverage config to `[tool.coverage]` so pytest works without pytest-cov (#12)
+- Analyze spring issue (#18)
+- Default overage policy from `REJECT` to `ALLOW_IF_AVAILABLE` (#19)
+- Bump version to 0.2.0 for protocol v0.1.24 (#21)
+
+### Removed
+
+- Redundant `--cov-fail-under=85` from CI workflow (#11)
+
+### Fixed
+
+- Broken docs URLs and add API key comment to examples (#14)
+
+## [0.1.3] - 2026-03-15
+
+Minor updates, bug fixes, test coverage.
+
+### Added
+
+- Comprehensive audit report and code quality improvements (#7)
+- Enforce 85% pytest coverage threshold in CI (#8)
+
+### Changed
+
+- Review Python cycles client (#5)
+
+### Fixed
+
+- Close all coverage gaps, achieve 100% coverage (#6)
+
+## [0.1.2] - 2026-03-13
+
+Cleanup, bug fixes, spec alignment, test coverage.
+
+### Added
+
+- Comprehensive test coverage and input validation (#2)
+- Validate Python client (#4)
+
+### Fixed
+
+- Enforce spec-required fields and fix estimate validation (#3)
+
+## [0.1.1] - 2026-03-12
+
+### Changed
+
+- Minor doc updates.
+
+## [0.1.0] - 2026-03-12
+
+Initial public release.
+
+### Added
+
+- Comprehensive error handling and improved API model validation (#1)
+
+[0.3.0]: https://github.com/runcycles/cycles-client-python/compare/v0.2.0...v0.3.0
+[0.2.0]: https://github.com/runcycles/cycles-client-python/compare/v0.1.3...v0.2.0
+[0.1.3]: https://github.com/runcycles/cycles-client-python/compare/v0.1.2...v0.1.3
+[0.1.2]: https://github.com/runcycles/cycles-client-python/compare/v0.1.1...v0.1.2
+[0.1.1]: https://github.com/runcycles/cycles-client-python/compare/v0.1.0...v0.1.1
+[0.1.0]: https://github.com/runcycles/cycles-client-python/releases/tag/v0.1.0