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features: re-enable & triage DISABLED tests - #29752 Requires: https://github.com/opencv/opencv_extra/pull/1404 ### PR Changes: ### features test cleanup ### Re-enabled - `Features2d_Detector_MSER.regression` (`test_detectors_regression.cpp:47`). Two things were needed: - `MSER_Impl` overrides `detect()` and had dropped the empty-image guard its base class carries, so the harness's 0x0 probe reached `detectRegions`, which rejects anything under 3x3. Added the guard; FAST and GFTT already carry the identical block. - The stored baseline held 215 keypoints against the 210 MSER finds today. The drift comes from `minDiversity` entering region rejection in `fa73b91e39` and the later `fitEllipse` rework. ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work - [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [x] The feature is well documented and sample code can be built with the project CMake