Adds `eval.yaml` using the registered `extractbench` framework, with the overall mean and six challenge groups. Restores `rl-environment` alongside `harbor` to test Benchmark/RL badge coexistence.
Only `eval.yaml` and the dataset-card tag change; data and Harbor tasks are unchanged. YAML and task mappings were checked against the existing ExtractBench registration and Pro dataset configuration. Official Benchmark activation may require HF allowlisting; badge precedence remains to be checked after merge.
