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[CK_TILE] Restructure naive GEMM tutorial and add tile distribution tutorials (#7714) ## Summary - Flatten naive GEMM tutorial directory structure (remove `block_level/`, `host_level/`, `warp_level/` subdirs) to match the composable_kernel repo layout - Add `CK_TILE_ENABLE_TRANSPOSED_C_DISTRIBUTION` macro switch to toggle between standard and transposed WarpGemm variants - Consolidate 6 verbose markdown files (~2600 lines) into one concise README (~120 lines) - Add 3 tile distribution encoding tutorials with step-by-step "How to read Ps/Ys" annotations: - Tutorial 1: A-matrix DRAM load (256×32) — NDimP=2, coalesced K-splitting - Tutorial 2: B-matrix DRAM load (128×32) — same pattern, fewer iterations - Tutorial 3: C-matrix register layout (32×32) — MFMA m32n32k8 hardware output mapping, standard vs transposed - Tile distribution tutorials guarded to build only for gfx942 and gfx950