chore(adk-middleware): release version 0.5.2

[contextablemark]

Summary

• Bump ag_ui_adk version from 0.5.1 to 0.5.2
• Update CHANGELOG.md to demarcate all unreleased changes under the 0.5.2 release heading

Test plan

• Verify pyproject.toml version is 0.5.2
• Verify CHANGELOG.md has [0.5.2] - 2026-03-26 section with all prior unreleased entries

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Project	Deployment	Actions	Updated (UTC)
ag-ui-dojo	Ready	Preview, Comment	Mar 26, 2026 11:39pm

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Auto-approved: PR author contextablemark has CODEOWNERS access to all changed files (excluding root rule)

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Python Preview Packages

Version 0.0.0.dev1774568218 published to TestPyPI.

Warning: These packages are built from contributor code that may not yet have been vetted for correctness or security. Install at your own risk and do not use in production.

Install with uv

Add the TestPyPI index to your pyproject.toml:

[[tool.uv.index]]
name = "testpypi"
url = "https://test.pypi.org/simple/"
explicit = true

Then install the packages you need:

# Core SDK
uv add 'ag-ui-protocol==0.0.0.dev1774568218' --index testpypi

# Integrations (each already depends on the matching ag-ui-protocol preview)
uv add 'ag-ui-langgraph==0.0.0.dev1774568218' --index testpypi
uv add 'ag-ui-crewai==0.0.0.dev1774568218' --index testpypi
# NOTE: ag-ui-agent-spec depends on pyagentspec (git-only, not on PyPI).
# You will need to install pyagentspec separately from its git repo.
uv add 'ag-ui-agent-spec==0.0.0.dev1774568218' --index testpypi
uv add 'ag_ui_adk==0.0.0.dev1774568218' --index testpypi
uv add 'ag_ui_strands==0.0.0.dev1774568218' --index testpypi

Install with pip

pip install \
  --index-url https://test.pypi.org/simple/ \
  --extra-index-url https://pypi.org/simple/ \
  ag-ui-protocol==0.0.0.dev1774568218

Use --extra-index-url https://pypi.org/simple/ so pip can resolve
transitive dependencies (pydantic, fastapi, etc.) from real PyPI.

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Commit: 39d3229