[FEATURE]: Distribute an OSS Google Chat adapter for AURA #753

Summary

Outcome

A user can deploy the supported open-source Google Chat adapter, provide their Google Chat configuration and credentials, and interact with a self-hosted AURA deployment from Google Chat without writing integration code or requiring Mezmo-hosted infrastructure.

Scope

• Distribute the Google Chat adapter as an open-source repository.
• Support direct messages and supported space interactions.
• Map Google Chat conversations to AURA sessions through the shared adapter contract.
• Support a customer-managed public HTTPS endpoint for receiving Google Chat events.
• Make deployment configuration-driven, including Google Chat credentials and the target AURA endpoint.
• Keep the Google-specific integration layer separate from AURA's core agent runtime.
• Keep AURA private by allowing the public Google Chat adapter endpoint to communicate with AURA over the customer’s internal network.

Out of Scope

• Google Workspace Marketplace distribution.
• Mezmo-hosted ingress or workspace routing.
• Native managed installation or administration through the Mezmo commercial platform.

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