chore: import upstream snapshot with attribution

examples/eval-custom-grader-csv/README.md

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+# eval-custom-grader-csv (Custom Grader Csv)
+
+You can run this example with:
+
+```bash
+npx promptfoo@latest init --example eval-custom-grader-csv
+cd eval-custom-grader-csv
+```
+
+## Usage
+
+This example uses a custom assertion in `customAssertion.ts` and reads test cases from `tests.csv`.
+The `__expected` column in `tests.csv` points to this assertion script.
+
+Run:
+
+```bash
+promptfoo eval
+```
+
+Full command-line equivalent:
+
+```bash
+promptfoo eval --prompts prompts.txt --tests tests.csv --providers openai:gpt-4.1-mini --output output.json
+```

examples/eval-custom-grader-csv/customAssertion.ts

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+export default function (output, context) {
+  return output.toLowerCase().includes('ahoy') || output.toLowerCase().includes('bonjour');
+}

examples/eval-custom-grader-csv/promptfooconfig.yaml

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+# yaml-language-server: $schema=https://promptfoo.dev/config-schema.json
+description: Custom grader in CSV
+prompts:
+  - file://prompts.txt
+providers:
+  - openai:gpt-4.1-mini
+tests: file://tests.csv

examples/eval-custom-grader-csv/prompts.txt

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+Rephrase this in French: {{body}}
+---
+Rephrase this like a pirate: {{body}}

examples/eval-custom-grader-csv/tests.csv

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+language,body,__expected
+French,Hello world,javascript:file://customAssertion.ts
+French,I'm hungry,javascript:file://customAssertion.ts
+Pirate,Hello world,javascript:file://customAssertion.ts
+Pirate,I'm hungry,javascript:file://customAssertion.ts