chore(main): release 0.3.0

Author: release-please[bot]

CHANGELOG.md

@@ -1,5 +1,27 @@
 # Changelog
 
+## [0.3.0](https://github.com/a2aproject/a2a-python/compare/v0.2.16...v0.3.0) (2025-07-29)
+
+
+### ⚠ BREAKING CHANGES
+
+* Support for serving agent card at deprecated path ([#352](https://github.com/a2aproject/a2a-python/issues/352))
+
+### Features
+
+* Add server-side support for plumbing requested and activated extensions ([#333](https://github.com/a2aproject/a2a-python/issues/333)) ([4d5b92c](https://github.com/a2aproject/a2a-python/commit/4d5b92c61747edcabcfd825256a5339bb66c3e91))
+* Support for serving agent card at deprecated path ([#352](https://github.com/a2aproject/a2a-python/issues/352)) ([2444034](https://github.com/a2aproject/a2a-python/commit/2444034b7aa1d1af12bedecf40f27dafc4efec95))
+* support non-blocking `sendMessage` ([#349](https://github.com/a2aproject/a2a-python/issues/349)) ([70b4999](https://github.com/a2aproject/a2a-python/commit/70b499975f0811c8055ebd674bcb4070805506d4))
+* Type update to support fetching extended card ([#361](https://github.com/a2aproject/a2a-python/issues/361)) ([83304bb](https://github.com/a2aproject/a2a-python/commit/83304bb669403b51607973c1a965358d2e8f6ab0))
+
+
+### Bug Fixes
+
+* Add Input Validation for Task Context IDs in new_task Function ([#340](https://github.com/a2aproject/a2a-python/issues/340)) ([a7ed7ef](https://github.com/a2aproject/a2a-python/commit/a7ed7efed8fcdcc556616a5fc1cb8f968a116733))
+* Remove `DeprecationWarning` for regular properties ([#345](https://github.com/a2aproject/a2a-python/issues/345)) ([2806f3e](https://github.com/a2aproject/a2a-python/commit/2806f3eb7e1293924bb8637fd9c2cfe855858592))
+* **spec:** Add `SendMessageRequest.request` `json_name` mapping to `message` proto ([bc97cba](https://github.com/a2aproject/a2a-python/commit/bc97cba5945a49bea808feb2b1dc9eeb30007599))
+* **spec:** Add Transport enum to specification (https://github.com/a2aproject/A2A/pull/909) ([d9e463c](https://github.com/a2aproject/a2a-python/commit/d9e463cf1f8fbe486d37da3dd9009a19fe874ff0))
+
 ## [0.2.16](https://github.com/a2aproject/a2a-python/compare/v0.2.15...v0.2.16) (2025-07-21)