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- Add @MaxLength(500) to BrainQueryDto.query and BrainQueryDto.search fields - Create BrainSearchDto with validated q (max 500 chars) and limit (1-100) fields - Update BrainController.search to use BrainSearchDto instead of raw query params - Add defensive validation in BrainService.search and BrainService.query methods: - Reject search terms exceeding 500 characters with BadRequestException - Clamp limit to valid range [1, 100] for defense-in-depth - Add comprehensive tests for DTO validation and service-level guards - Update existing controller tests for new search method signature Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>