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[CK_TILE] FMHA BWD Launcher Interface ## Motivation Reduce memory usage; Be prepared to implement optimizations of reducing nsplits in deterministic cases. ## Technical Details This PR introduces a new launcher interface for the FMHA backward operation, replacing direct function calls with a more structured approach. The launcher encapsulates kernel dispatch logic and provides access to computed metadata like the number of dQ acc splits. **Changes:** - Added `fmha_bwd_launcher` class that wraps kernel execution and exposes `dq_acc_splits` - Moved `fmha_bwd_traits` construction earlier in the execution flow to support launcher initialization - Refactored code generation to produce both legacy API and new launcher constructor ## Test Plan <!-- Explain any relevant testing done to verify this PR. --> ## Test Result <!-- Briefly summarize test outcomes. --> ## Submission Checklist - [x] Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.