removing md

Author: xDarkicex

.kiro/specs/competitive-features-phase3/tasks.md

@@ -41,7 +41,7 @@
   - Write tests for mmap functionality and memory usage reduction
   - _Requirements: 5.3, 5.4, 5.6_
 
-- [-] 7. Build metadata filtering query engine foundation
+- [x] 7. Build metadata filtering query engine foundation
   - Create filter interface hierarchy for different filter types
   - Implement equality, range, and containment filter classes
   - Add filter parsing and validation logic