chore: publish from staged

plugins/phoenix/skills/phoenix-evals/references/experiments-overview.md

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+# Experiments: Overview
+
+Systematic testing of AI systems with datasets, tasks, and evaluators.
+
+## Structure
+
+```
+DATASET     → Examples: {input, expected_output, metadata}
+TASK        → function(input) → output
+EVALUATORS  → (input, output, expected) → score
+EXPERIMENT  → Run task on all examples, score results
+```
+
+## Basic Usage
+
+```python
+from phoenix.client.experiments import run_experiment
+
+experiment = run_experiment(
+    dataset=my_dataset,
+    task=my_task,
+    evaluators=[accuracy, faithfulness],
+    experiment_name="improved-retrieval-v2",
+)
+
+print(experiment.aggregate_scores)
+# {'accuracy': 0.85, 'faithfulness': 0.92}
+```
+
+## Workflow
+
+1. **Create dataset** - From traces, synthetic data, or manual curation
+2. **Define task** - The function to test (your LLM pipeline)
+3. **Select evaluators** - Code and/or LLM-based
+4. **Run experiment** - Execute and score
+5. **Analyze & iterate** - Review, modify task, re-run
+
+## Dry Runs
+
+Test setup before full execution:
+
+```python
+experiment = run_experiment(dataset, task, evaluators, dry_run=3)  # Just 3 examples
+```
+
+## Best Practices
+
+- **Name meaningfully**: `"improved-retrieval-v2-2024-01-15"` not `"test"`
+- **Version datasets**: Don't modify existing
+- **Multiple evaluators**: Combine perspectives