Restore China politics tasks in public LexBench-Browser data

Fix dataset loading config after task removal

Fix LexBench-Browser public dataset loading config

Update LexBench-Browser public dataset card after task removal

Update dataset card

Clarify dataset card naming

Fix dataset card metadata

Update dataset card

docs: bump README to v3.1 stats (210 tasks; document risk_control / multi-site target_website)

docs: update README counts to reflect 217 task release

docs: clean README — drop references to non-public mirror

docs: refresh README for v3.0 (single task.jsonl, 220 tasks, no scenario_tier)

Upload folder using huggingface_hub

initial commit