Merge pull request #74 from reacher-z/add-citation-cff-2026-04-16

Add date-released field to CITATION.cff

Author: reacher-z

CITATION.cff

@@ -5,6 +5,7 @@ type: software
 license: Apache-2.0
 url: "https://claw-bench.com"
 repository-code: "https://github.com/reacher-z/ClawBench"
+date-released: "2026-04-16"
 authors:
   - family-names: Zhang
     given-names: Yuxuan