chore(main): release 0.3.0

[release-please]

🤖 I have created a release beep boop

0.3.0 (2025-06-04)

⚠ BREAKING CHANGES

• Add FastAPI JSONRPC Application (#104)

Features

• Add FastAPI JSONRPC Application (#104) (0e66e1f)
• add reject method to task_updater (#147) (2a6ef10)
• Add timestamp to TaskStatus updates on TaskUpdater (#140) (0c9df12)
• spec: Add an optional iconUrl field to the AgentCard 🤖 (a1025f4)

Bug Fixes

• Correctly adapt starlette BaseUser to A2A User (#133) (88d45eb)
• Fix Release Version (#161) (011d632)
• generate StrEnum types for enums (#134) (0c49dab)
• remove error types from enqueable events (#138) (511992f)
• Remove examples from toml (#127) (2b29c09)
• remove unnecessary hasattr checks (#146) (1107151)
• stream: don't block event loop in EventQueue (#151) (efd9080)
• task_updater: fix potential duplicate artifact_id from default v… (#156) (1f0a769)

Documentation

• fix and clarify path to hello world example in usage instructions (#136) (4d658a5)
• remove final and metadata fields from docstring (#66) (3c50ee1)
• Update Links to Documentation Site (5e7d418)

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