chore: import upstream snapshot with attribution

examples/config-retry-testing/README.md

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+# config-retry-testing (Retry Testing)
+
+You can run this example with:
+
+```bash
+npx promptfoo@latest init --example config-retry-testing
+cd config-retry-testing
+```
+
+## Usage
+
+This example creates a test harness with a high error rate (~50%) to test the retry functionality using `promptfoo eval --retry-errors`.

examples/config-retry-testing/errorProvider.js

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+class ErrorProneProvider {
+  constructor(options) {
+    this.providerId = options.id || 'error-prone-provider';
+    this.config = options.config || {};
+  }
+
+  id() {
+    return this.providerId;
+  }
+
+  async callApi(prompt) {
+    console.log(`[ErrorProneProvider] Processing prompt: ${prompt}`);
+
+    // Throw error based on probability (50% chance)
+    if (Math.random() < 0.5) {
+      throw new Error('API request failed: Simulated error for testing retry logic');
+    }
+
+    // Success cases - return a mock response
+    const responses = [
+      `Here's information about the topic you requested.`,
+      `This is a successful response for your query.`,
+      `I can help explain this concept clearly.`,
+      `This provider successfully processed your request.`,
+    ];
+
+    const randomResponse = responses[Math.floor(Math.random() * responses.length)];
+
+    return {
+      output: randomResponse,
+      tokenUsage: {
+        total: 50,
+        prompt: 20,
+        completion: 30,
+      },
+    };
+  }
+}
+
+module.exports = ErrorProneProvider;

examples/config-retry-testing/promptfooconfig.yaml

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+# yaml-language-server: $schema=https://promptfoo.dev/config-schema.json
+
+description: 'Retry Testing - High Error Rate Example (Offline Mode)'
+
+prompts:
+  - 'Tell me about {{topic}}'
+
+providers:
+  - id: file://errorProvider.js
+    label: 'Error-prone provider'
+
+tests:
+  # Success cases (20% success rate)
+  - vars:
+      topic: 'success case 1'
+    assert:
+      - type: not-equals
+        value: 'SHOULD_NEVER_MATCH'
+
+  - vars:
+      topic: 'success case 2'
+    assert:
+      - type: not-equals
+        value: 'SHOULD_NEVER_MATCH'
+
+  # Error cases (80% error rate)
+  - vars:
+      topic: 'ERROR_NETWORK_FAILURE'
+
+  - vars:
+      topic: 'ERROR_API_LIMIT'
+
+  - vars:
+      topic: 'ERROR_CONNECTION_REFUSED'
+
+  - vars:
+      topic: 'ERROR_AUTHENTICATION_FAILED'
+
+  - vars:
+      topic: 'ERROR_SERVICE_UNAVAILABLE'
+
+  - vars:
+      topic: 'ERROR_TIMEOUT_EXCEEDED'
+
+  - vars:
+      topic: 'ERROR_PARSE_FAILURE'
+
+  - vars:
+      topic: 'ERROR_RATE_LIMITED'
+
+outputPath: retry-test-results-offline.json