chore(epic/1.0_breaking_changes): release 1.0.0-beta.1

[a2a-bot]

🤖 I have created a release beep boop

1.0.0-beta.1 (2026-07-16)

⚠ BREAKING CHANGES

• server: replace individual properties with SendMessageRequest in RequestContext (#581)

Features

• add state bag and ServerCallContextBuilder to ServerCallContext (#364) (477e394)
• export SSE wire-format helpers from public entry point (#548) (8bc21f5), closes #547
• server: expose SendMessageRequest metadata to AgentExecutor via RequestContext (#564) (a92f54e)
• server: replace individual properties with SendMessageRequest in RequestContext (#581) (7cd30de)

Bug Fixes

• client: bound SSE event size to prevent client-side memory exhaustion (#582) (e6e8ce9)
• client: cancel the SSE stream on teardown to avoid leaking connections (#580) (83269a5)
• grpc: preserve null values in protobuf Struct (#578) (f447e4e), closes #576
• resolve sdk compatibility bugs and add itk scenarios (#568) (b57f026)
• server: await _handleProcessingError so blocking drains surface errors (#579) (5833652)

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[gemini-code-assist]

Code Review

This pull request bumps the version of the @a2a-js/sdk package from 1.0.0-beta.0 to 1.0.0-beta.1 across the project's configuration files, including .release-please-manifest.json, package.json, and package-lock.json. It also updates the CHANGELOG.md to document the new release and its features. There are no review comments, and I have no feedback to provide.

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