chore: import upstream snapshot with attribution

examples/eval-context-relevance-grader-output/README.md

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+# eval-context-relevance-grader-output (Context Relevance Grader Output)
+
+This example shows how `context-relevance` stores the raw judge response in
+assertion metadata so it can be inspected in View.
+
+## Run
+
+Run it with:
+
+```bash
+npx promptfoo@latest init --example eval-context-relevance-grader-output
+cd eval-context-relevance-grader-output
+npx promptfoo@latest eval --no-cache
+npx promptfoo@latest view
+```
+
+## Inspect
+
+Open a row's details and select the Evaluation tab. The Reason column includes
+the score explanation plus the judge response under "Grader output".

examples/eval-context-relevance-grader-output/judge-provider.mjs

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+export default class ContextRelevanceDemoJudge {
+  id() {
+    return 'context-relevance-demo-judge';
+  }
+
+  async callApi() {
+    return {
+      output: 'Paris is the capital of France.\nFrance is in Europe.',
+    };
+  }
+}

examples/eval-context-relevance-grader-output/promptfooconfig.yaml

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+# yaml-language-server: $schema=https://promptfoo.dev/config-schema.json
+description: Context relevance grader output
+
+prompts:
+  - 'Answer this question: {{ query }}'
+
+providers:
+  - id: echo
+    label: Echo target
+
+tests:
+  - description: Judge output appears with the assertion result
+    vars:
+      query: What is the capital of France?
+      context: |-
+        Paris is the capital of France.
+        France is in Europe.
+    assert:
+      - type: context-relevance
+        threshold: 0.8
+    options:
+      provider:
+        text:
+          id: file://./judge-provider.mjs
+          label: Demo judge