chore: import upstream snapshot with attribution

examples/integrations/a2a-middleware/.env.example

@@ -0,0 +1,51 @@
+# ========================================
+# API Keys (REQUIRED)
+# ========================================
+
+# Google API Key (for ADK agents: Orchestrator, Analysis)
+# Get your key from: https://aistudio.google.com/app/apikey
+GOOGLE_API_KEY=your_google_api_key_here
+
+# OpenAI API Key (for LangGraph agents: Research)
+# Get your key from: https://platform.openai.com/api-keys
+OPENAI_API_KEY=your_openai_api_key_here
+
+
+# ========================================
+# Agent URLs (Frontend → Agents)
+# Optional - these are the defaults
+# ========================================
+
+# Orchestrator (ADK + AG-UI Protocol)
+ORCHESTRATOR_URL=http://localhost:9000
+
+# Research Agent (LangGraph + A2A Protocol)
+RESEARCH_AGENT_URL=http://localhost:9001
+
+# Analysis Agent (ADK + A2A Protocol)
+ANALYSIS_AGENT_URL=http://localhost:9002
+
+
+# ========================================
+# Agent Ports (Python Agents)
+# Optional - used by Python agents to bind to specific ports
+# ========================================
+
+# Orchestrator
+ORCHESTRATOR_PORT=9000
+
+# Research Agent
+RESEARCH_PORT=9001
+
+# Analysis Agent
+ANALYSIS_PORT=9002
+
+
+# ========================================
+# CopilotKit Intelligence Threads (Optional)
+# ========================================
+
+# COPILOTKIT_LICENSE_TOKEN=
+# INTELLIGENCE_API_KEY=
+# INTELLIGENCE_API_URL=http://localhost:4201
+# INTELLIGENCE_GATEWAY_WS_URL=ws://localhost:4401