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[CK] Fix smart build false positives from merged commits (#7289) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit ## Motivation Current smart-build infrastructure triggers full build for almost every PR which is draining our CI infrastructure. Need to update the test selection logic based on diffs from the current workspace instead of entire repo. ## Technical Details Use three-dot syntax and scope BUILD_INFRA_PATTERN to composablekernel. Changes: - Switch from two-dot (..) to three-dot (...) in git diff - Three-dot shows only PR-specific changes - Excludes commits merged from develop (prevents false positives) - Scope BUILD_INFRA_PATTERN to projects/composablekernel/ paths only - Avoids triggering on other projects (hipblas, hipdnn, etc.) - Only composablekernel build infra changes trigger full build - Update both ci_safety_check.sh and validate_pr.sh ## Test Plan Test with PR 7112 and 7223 ## Test Result Impact: - PR 7112: Was 620 files (false positive) → Now 6 files (correct) - PR 7223: Was full build (false positive) → Now selective build (correct) ## Submission Checklist - [ x] Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.