chore: import upstream snapshot with attribution

examples/provider-cloudflare/gateway/README.md

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+# provider-cloudflare/gateway (Cloudflare AI Gateway)
+
+You can run this example with:
+
+```bash
+npx promptfoo@latest init --example provider-cloudflare/gateway
+cd provider-cloudflare/gateway
+```
+
+This example demonstrates how to route AI requests through [Cloudflare AI Gateway](https://developers.cloudflare.com/ai-gateway/) for caching, rate limiting, and analytics.
+
+## Prerequisites
+
+1. A Cloudflare account with AI Gateway enabled
+2. An AI Gateway created in your Cloudflare dashboard
+3. API keys for the providers you want to use (OpenAI, Anthropic, Groq, etc.)
+
+## Setup
+
+Set the required environment variables:
+
+```bash
+export CLOUDFLARE_ACCOUNT_ID=your_account_id
+export CLOUDFLARE_GATEWAY_ID=your_gateway_id
+export OPENAI_API_KEY=your_openai_key
+export ANTHROPIC_API_KEY=your_anthropic_key
+export GROQ_API_KEY=your_groq_key
+```
+
+## Running the Example
+
+```bash
+npx promptfoo eval -c examples/provider-cloudflare/gateway/promptfooconfig.yaml
+```
+
+## What This Example Does
+
+The configuration compares responses from three different providers, all routed through Cloudflare AI Gateway:
+
+- **OpenAI** (gpt-4o-mini)
+- **Anthropic** (claude-haiku-4-5-20251001)
+- **Groq** (llama-3.1-8b-instant)
+
+Each provider answers questions about technical topics, and the assertions verify that responses contain relevant keywords.
+
+## Benefits of Using AI Gateway
+
+- **Caching**: Identical requests are cached, reducing costs during development
+- **Analytics**: View usage across all providers in your Cloudflare dashboard
+- **Rate Limiting**: Protect against quota issues with request queuing
+- **Logging**: All requests and responses are logged for debugging
+
+## Documentation
+
+See the [Cloudflare AI Gateway provider documentation](https://www.promptfoo.dev/docs/providers/cloudflare-gateway) for more details.

examples/provider-cloudflare/gateway/promptfooconfig.yaml

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+# yaml-language-server: $schema=https://promptfoo.dev/config-schema.json
+# Cloudflare AI Gateway Example
+#
+# This example demonstrates routing AI requests through Cloudflare AI Gateway
+# for caching, rate limiting, and analytics.
+#
+# Required environment variables:
+#   CLOUDFLARE_ACCOUNT_ID - Your Cloudflare account ID
+#   CLOUDFLARE_GATEWAY_ID - Your AI Gateway ID
+#
+# Optional environment variables:
+#   CF_AIG_TOKEN - Required if your gateway has "Authenticated Gateway" enabled
+#
+# Provider API keys (choose based on which providers you use):
+#   OPENAI_API_KEY - OpenAI API key
+#   ANTHROPIC_API_KEY - Anthropic API key
+#   GROQ_API_KEY - Groq API key
+#
+# Note: If you've configured BYOK (Bring Your Own Keys) in Cloudflare dashboard,
+# you can omit the provider API keys - Cloudflare will use the stored keys.
+#
+# Run with:
+#   npx promptfoo eval -c examples/provider-cloudflare/gateway/promptfooconfig.yaml
+
+description: Cloudflare AI Gateway comparison
+
+prompts:
+  - 'Explain {{topic}} in simple terms, in about 2-3 sentences.'
+
+providers:
+  # Route OpenAI requests through Cloudflare AI Gateway
+  - id: cloudflare-gateway:openai:gpt-4o-mini
+    config:
+      accountId: '{{env.CLOUDFLARE_ACCOUNT_ID}}'
+      gatewayId: '{{env.CLOUDFLARE_GATEWAY_ID}}'
+      # Uncomment if using authenticated gateway:
+      # cfAigToken: '{{env.CF_AIG_TOKEN}}'
+      temperature: 0.7
+      max_tokens: 200
+
+  # Route Anthropic requests through Cloudflare AI Gateway
+  - id: cloudflare-gateway:anthropic:claude-haiku-4-5-20251001
+    config:
+      accountId: '{{env.CLOUDFLARE_ACCOUNT_ID}}'
+      gatewayId: '{{env.CLOUDFLARE_GATEWAY_ID}}'
+      # Uncomment if using authenticated gateway:
+      # cfAigToken: '{{env.CF_AIG_TOKEN}}'
+      max_tokens: 200
+
+  # Route Groq requests through Cloudflare AI Gateway
+  - id: cloudflare-gateway:groq:llama-3.1-8b-instant
+    config:
+      accountId: '{{env.CLOUDFLARE_ACCOUNT_ID}}'
+      gatewayId: '{{env.CLOUDFLARE_GATEWAY_ID}}'
+      # Uncomment if using authenticated gateway:
+      # cfAigToken: '{{env.CF_AIG_TOKEN}}'
+      temperature: 0.7
+      max_tokens: 200
+
+tests:
+  - vars:
+      topic: machine learning
+    assert:
+      - type: contains-any
+        value:
+          - algorithm
+          - data
+          - learn
+          - pattern
+
+  - vars:
+      topic: quantum computing
+    assert:
+      - type: contains-any
+        value:
+          - qubit
+          - quantum
+          - superposition
+          - computer
+
+  - vars:
+      topic: blockchain
+    assert:
+      - type: contains-any
+        value:
+          - block
+          - chain
+          - ledger
+          - decentralized