fix README: repair model-index, clarify artifact state, summarize eval artifacts

improve eval_results README: full-family benchmark table, artifact consumption snippet, clearer limitations

chore(card): improve eval_results README metadata, bench table, usage, and model-index

docs(eval-results): add model description + live benchmark summary table from artifact YAML

docs: improve eval_results README — artifact inventory + runnable consumption snippet, tag hygiene

improve model card: pipeline section, artifact inventory, citation, limitations

feat(card): first-time README for eval_results companion repo