Release v0.3.2

• Promoted Anthropic support into the official agora-etl-plugins bundle through the anthropic extra
• Added the agora.ai.providers entry-point for AnthropicProvider under the agora_plugins.anthropic namespace
• Raised the core compatibility floor to agora-etl>=0.3.3
• Updated bundle docs and package quickstart guidance to position Anthropic as an official completion and structured-output integration
• Added regression coverage for the official Anthropic provider path, including structured-output and unsupported-embedding behavior