Release v0.4.3

What's Changed

• new version 0.4.1 by @OriNachum in #45
• docs: refresh architecture, event system docs, Jekyll cream theme, and skills by @OriNachum in #46
• fix: support streamable-http and SSE MCP transports by @OriNachum in #47
• test: improve test coverage from 22% to 91% by @OriNachum in #48
• fix: stabilize PyPI deployment pipeline by @OriNachum in #49
• fix: resolve SonarCloud quality gate failures by @OriNachum in #50
• fix: combine release and publish workflows for reliable PyPI deploys by @OriNachum in #51

Full Changelog: v0.4.2...v0.4.3