Add genmedia-for-commerce agent

[lspataroG]

Summary

• Adds the genmedia-for-commerce agent to python/agents/genmedia-for-commerce/
• AI-powered commerce media generation agent built with Google ADK, providing virtual try-on (clothes & glasses), product spinning videos, background changing, and product enrichment via MCP server + orchestrator architecture
• Runs on Gemini Enterprise — deploy the agent to Vertex AI Agent Engine and register it with Gemini Enterprise
• Binary assets (catalogue, model weights, images) are auto-downloaded from GCS at startup — not included in this PR

What's included

• ADK agent with Gemini-powered orchestration (genmedia4commerce/)
• MCP server exposing media generation workflows as tools
• FastAPI backend with chat API and streaming support
• Deployment configs: Dockerfile, Terraform (Cloud Run, Artifact Registry, Cloud Build)
• Evaluation framework with evalsets
• Unit and integration tests

What's excluded

• Binary assets (images, model weights, catalogue data) — downloaded automatically from GCS via config.py
• Frontend app (served as static build from backend)

Infrastructure Setup

Before running the agent, GCP infrastructure must be provisioned:

make setup-infra

This creates Artifact Registry repo, Cloud Run service, and IAM bindings via Terraform.

Test plan

See the README for full setup and testing instructions:

• make install — install dependencies
• make dev — run backend + frontend locally
• make playground — ADK agent interactive testing
• make test — run unit + integration tests
• make eval — run agent evaluation
• make deploy-cloudrun — deploy full app to Cloud Run
• make deploy-agent-engine — deploy agent to Vertex AI Agent Engine
• make register-gemini-enterprise — register with Gemini Enterprise

[eliasecchig]

Will review this!

[eliasecchig]

LGTM!