Agentic Commerce Backend Implementation

[git-hari-j]

Implemented a production-grade backend for the Agentic Commerce Platform as requested.

Features:

• Architecture: LangGraph Hub-and-Spoke with an LLM-based Orchestrator.
• Agents: specialized agents for Product Discovery, Cart Management, Checkout Readiness, Order Management, Payment Operations, and Fulfillment.
• Tools: Robust Python wrappers for Adobe Commerce 2.4.8 REST APIs (add_to_cart, check_stock, refund_payment, etc.).
• Guardrails: Enforced via environment variables (e.g., REQUIRE_STOCK_CHECK prevents adding out-of-stock items, ALLOW_ORDER_CANCEL controls policy).
• State Management: Redis-backed state persistence for multi-turn conversations, including Cart ID tracking.
• Config: 12-factor app compliant configuration using pydantic-settings.
• Testing: Unit tests covering tool logic and guardrails.

The backend is located in the backend/ directory and exposes a POST /api/chat endpoint.
Dependencies are listed in backend/requirements.txt.
Design documentation is in backend/DESIGN.md.

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PR created automatically by Jules for task 12188264572661119588 started by @git-hari-j

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