Add representative environment dataset

README.md

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+---
+pretty_name: Environment Dataset Example
+tags:
+  - environment
+  - harbor
+  - verifiers
+configs:
+  - config_name: tasks
+    data_files:
+      - split: train
+        path: data/train.jsonl
+---
+
+# Environment Dataset Example
+
+This repository is an ordinary Hub dataset with one Dataset Viewer config named
+`tasks`. The `environment.yaml` file declares how environment clients should
+interpret that config and its associated files.
+
+Once this repository is pushed to the Hub, the existing **Use this dataset**
+menu can generate standard loading snippets from the `tasks` config:
+
+```python
+from datasets import load_dataset
+
+tasks = load_dataset("burtenshaw/environment-dataset-example", "tasks", split="train")
+```
+
+Environment clients can download the declaration without a custom Hub API:
+
+```python
+from huggingface_hub import hf_hub_download
+
+manifest_path = hf_hub_download(
+    repo_id="burtenshaw/environment-dataset-example",
+    repo_type="dataset",
+    filename="environment.yaml",
+)
+```
+
+The equivalent raw URL is:
+
+```text
+https://huggingface.co/datasets/burtenshaw/environment-dataset-example/resolve/main/environment.yaml
+```

data/train.jsonl

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+{"task_id":"hello-environment","task_path":"tasks/hello-environment","prompt":[{"role":"user","content":"Create /tmp/hello.txt containing exactly: hello environment"}],"answer":"hello environment","info":{"category":"filesystem"}}

environment.yaml

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+spec_version: hf-env-0.1
+environments:
+  - id: terminal-tasks
+    title: Terminal Tasks Example
+    config_name: tasks
+    splits: [train]
+    frameworks:
+      harbor:
+        min_version: ">=0.1.0"
+      verifiers:
+        min_version: ">=0.1.14"
+        adapter: verifiers.v1.packages.tasksets.HarborTaskset
+    dataset:
+      task_root: tasks
+      task_id_column: task_id
+      task_path_column: task_path
+    runtime:
+      isolation: container
+      network: disabled
+    reward:
+      type: scalar

tasks/hello-environment/instruction.md

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+Create `/tmp/hello.txt` containing exactly:
+
+```text
+hello environment
+```

tasks/hello-environment/solution/solve.sh

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+#!/bin/sh
+set -eu
+
+mkdir -p /tmp
+printf 'hello environment\n' > /tmp/hello.txt

tasks/hello-environment/task.toml

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+version = "1.0"
+
+[metadata]
+author_name = "Hugging Face"
+author_email = "example@huggingface.co"
+difficulty = "easy"
+category = "filesystem"
+tags = ["example", "environment"]
+
+[verifier]
+timeout_sec = 30.0
+
+[agent]
+timeout_sec = 30.0

tasks/hello-environment/tests/test.sh

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+#!/bin/sh
+set -eu
+
+test "$(cat /tmp/hello.txt)" = "hello environment"