chore: import upstream snapshot with attribution

examples/provider-groq/README.md

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+# provider-groq (Groq)
+
+You can run this example with:
+
+```bash
+npx promptfoo@latest init --example provider-groq
+cd provider-groq
+```
+
+## Usage
+
+To get started, set your `GROQ_API_KEY` environment variable.
+
+Next, edit promptfooconfig.yaml.
+
+Then run:
+
+```bash
+promptfoo eval
+```
+
+Afterwards, you can view the results by running `promptfoo view`

examples/provider-groq/promptfooconfig.yaml

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+# yaml-language-server: $schema=https://promptfoo.dev/config-schema.json
+description: 'Groq Provider Demo'
+
+prompts:
+  - 'Answer this question as concisely as possible: {{calculation}}'
+  - 'Calculate the following and provide a brief explanation: {{calculation}}'
+
+providers:
+  - id: groq:openai/gpt-oss-120b
+    label: 'GPT-OSS 120B with tools'
+    config:
+      max_completion_tokens: 1024
+      # gpt-oss is a reasoning model; keep reasoning minimal so the tool call
+      # isn't crowded out of the token budget.
+      reasoning_effort: 'low'
+      tools:
+        - type: function
+          function:
+            name: calculate
+            description: 'Evaluate a mathematical expression'
+            parameters:
+              type: object
+              properties:
+                expression:
+                  type: string
+                  description: 'The mathematical expression to evaluate'
+              required:
+                - 'expression'
+      tool_choice: auto
+  - id: groq:openai/gpt-oss-120b
+    label: 'GPT-OSS 120B with reasoning'
+    config:
+      temperature: 0.6
+      max_completion_tokens: 1000
+      include_reasoning: true
+      reasoning_effort: 'medium'
+  - id: groq:openai/gpt-oss-20b
+    label: 'GPT-OSS 20B (reasoning hidden)'
+    config:
+      temperature: 0.6
+      max_completion_tokens: 1000
+      include_reasoning: false
+
+tests:
+  - vars:
+      calculation: 25 * 4 + 10
+  - vars:
+      calculation: (8 + 2) * 5