Introduce the A2UI extension for declarative UI generation, including
support for both v0.8 and v0.9 protocol specs. Add A2UI content type
integration in A2A utils, along with schema definitions, catalog models,
and client extension improvements.
Enhance models with explicit defaults, field descriptions, and ConfigDict,
and improve typing and instance state handling across the extension.
Add schema conformance tests and align test structure.
Add and register A2UI documentation, including extension guide and
navigation updates.
* feat: add server-side auth schemes and protocol extensions
- add server auth scheme base class and implementations (api key, bearer token, basic/digest auth, mtls)
- add server-side extension system for a2a protocol extensions
- add extensions middleware for x-a2a-extensions header management
- add extension validation and registry utilities
- enhance auth utilities with server-side support
- add async intercept method to match client call interceptor protocol
- fix type_checking import to resolve mypy errors with a2aconfig
* feat: add transport negotiation and content type handling
- add transport negotiation logic with fallback support
- add content type parser and encoder utilities
- add transport configuration models (client and server)
- add transport types and enums
- enhance config with transport settings
- add negotiation events for transport and content type
* feat: add a2a delegation support to LiteAgent
* feat: add file input support to a2a delegation and tasks
Introduces handling of file inputs in A2A delegation flows by converting file dictionaries to protocol-compatible parts and propagating them through delegation and task execution functions. Updates include utility functions for file conversion, changes to message construction, and passing input_files through relevant APIs.
* feat: liteagent a2a delegation support to kickoff methods
