Add clean JSSP dataset (J1–J4 JSON)

.gitattributes

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 # Video files - compressed
 *.mp4 filter=lfs diff=lfs merge=lfs -text
 *.webm filter=lfs diff=lfs merge=lfs -text
+JSSP/J3.json filter=lfs diff=lfs merge=lfs -text
+JSSP/J4.json filter=lfs diff=lfs merge=lfs -text

JSSP/J3.json

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+size 12624211

JSSP/J4.json

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+oid sha256:b29b61892b81cf7d5729c26b79877d66c8f882c2ec0107b6c7ed601cd70f6b00
+size 12637719

JSSP/README.md

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+# REALM-Bench JSSP (clean)
+
+Four JSON files only — one per tier — with all instances in a **unified schema**.
+
+## Files
+
+| File | Tier | Instances | Description |
+|------|------|-----------|-------------|
+| `J1.json` | J1 | 109 | Static benchmarks (DMU, TA, ABZ, SWV, YN) |
+| `J2.json` | J2 | 109 | J1 + dynamic disruptions |
+| `J3.json` | J3 | 100 | Large-scale static (200×50) |
+| `J4.json` | J4 | 100 | Large-scale + disruptions |
+
+## Top-level structure (each file)
+
+```json
+{
+  "tier": "J1",
+  "format_version": "1.0",
+  "description": "...",
+  "objective": "minimize_makespan",
+  "num_instances": 109,
+  "instances": [ ... ]
+}
+```
+
+## Instance object (inside `instances`)
+
+```json
+{
+  "instance_id": "rcmax_50_20_9",
+  "tier": "J1",
+  "num_jobs": 50,
+  "num_machines": 20,
+  "jobs": [
+    [
+      {"operation": 1, "machine": 19, "processing_time": 64},
+      {"operation": 2, "machine": 16, "processing_time": 34}
+    ]
+  ],
+  "disruptions": [],
+  "metadata": {
+    "source_file": "DMU/rcmax_50_20_9.txt",
+    "benchmark": "DMU",
+    "objective": "minimize_makespan",
+    "description": "JSSP Basic (Static)"
+  }
+}
+```
+
+- **machine** — 1-based machine ID  
+- **disruptions** — empty for J1/J3; events for J2/J4  
+
+## Load in Python
+
+```python
+import json
+
+with open("datasets/clean/JSSP/J1.json") as f:
+    data = json.load(f)
+
+for inst in data["instances"]:
+    print(inst["instance_id"], inst["num_jobs"], inst["num_machines"])
+```
+
+## Rebuild
+
+```bash
+cd datasets && python3 build_jssp_dataset.py
+```
+
+Writes only `clean/JSSP/J1.json` … `J4.json`. Re-copy this README after rebuild if needed.
+
+## Hugging Face
+
+Upload `datasets/clean/JSSP/` to **GloriaGeng/REALM-Bench** on the Hugging Face Hub.