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

[a2a-bot]

🤖 I have created a release beep boop

1.0.0-alpha.1 (2026-06-16)

Features

• add opt-in legacy v0.3 compatibility to JSON-RPC handler and improve extension header support (#501) (f707350)
• add v0.3 compatibility layer for client and server agent-card handling (#504) (75685f2)
• add v0.3 gRPC compat layer (#505) (314d9e3)
• centralize v1.0 to v0.3 error conversion logic in new translate module (#509) (36d9a6b)
• default to 0.3 if version not provided (#511) (ad7f772)
• defined compat-specific consts and mappings (#478) (db0c595)
• implement legacy v0.3 JSON-RPC transport handler (#493) (d191d91)
• implement legacy v0.3 REST support with compatible transport handler and middleware routing (#495) (da9a968)
• implement v0.3 ITK cross-SDK validation workflows (#513) (c9385f3)
• implement v0.3 JSON-RPC client transport (#499) (46aa5d6)
• implement v0.3 protocol compatibility for RestTransportFactory (#503) (b172482)
• implement versioned push notification serializers with legacy v0.3 compatibility support (#507) (0261be8)
• normalize extension headers based on negotiated protocol version (#510) (74a51ee)

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Code Review

This pull request updates the project version from 1.0.0-alpha.0 to 1.0.0-alpha.1 across the manifest, package, and lock files, and adds a corresponding entry to the changelog. I have no feedback to provide.