chore(main): release 0.2.9

[release-please]

🤖 I have created a release beep boop

0.2.9 (2025-06-18)

⚠ BREAKING CHANGES

• Update A2A types from specification 🤖 (#197)

Features

• Add append and last_chunk to add_artifact method on TaskUpdater (#186) (8c6560f)
• add a2a routes to existing app (#188) (32fecc7)
• Add more task state management methods to TaskUpdater (#208) (2b3bf6d)
• raise error for tasks in terminal states (#215) (a0bf13b)
• Update A2A types from specification 🤖 (#197) (1fbf600)
• Update A2A types from specification 🤖 (#206) (3800c83)

Bug Fixes

• library release version (a9567ea)
• Lower fastapi required version to fastapi>=0.115.2 (#193) (8e713b7)
• update regex references for pushNotificationConfigs (#211) (325ad8c)

Documentation

• Update README.md to add instructions for using a2a-inspector (#214) (b88ca85)

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