Delete the unrelated TACRED-style test data and remove its README split declaration. Keep the standardized train/validation files and schema unchanged.
Remove the unrelated TACRED-style test split and the generic duplicate split files introduced in the recent conversion commits. Restore the GENIA event-extraction dataset card and keep only the correctly named labeled train/validation files. The official blind test inputs have no public event gold labels, so no labeled test split is published.
Every argument is now a uniform {role,text,start,end} span. Event-as-argument nesting is kept by having the argument repeat the child event's trigger span, with every event listed at the top level (previously: {role, event:{...}} inline subtrees, roots only). Matches the mneb convention of linking by shared span.
Add genia2011 in mneb format with event-as-argument nesting preserved
