Extended SYCL oneDNN SDPA to non-FP16 KV caches (Q4_0–Q8_0 and FP32) (#25874) sycl: extend oneDNN SDPA to Q4_0-Q8_0 and F32 KV caches Extends the oneDNN SDPA path (PR #25222) to handle non-F16 KV caches by dequantizing or converting K/V to dense FP16 on-device before feeding them into the SDPA graph. The fused systolic kernel then runs identically to the native FP16 path. Supported KV types: Q4_0, Q4_1, Q5_0, Q5_1, Q8_0: to_fp16_sycl / to_fp16_nc_sycl F32: cont_to_f16_sycl BF16 and IQ types are excluded (no conversion kernel available) Gate: non-F16 requires K >= 1024 and Q >= 32 (prefill only).

F16 KV runs at any length (existing behavior). Also includes the stream sync fix (stream->wait_and_throw() unconditional, PR #25741 by @malsbat) and removal of V_is_K_view aliasing (K and V are always dequantized to separate buffers). Co-Authored-By: Claude docs: drop GGML_SYCL_FA_DEBUG from SYCL.md (not shipped in this PR) Co-Authored-By: Claude --------- Co-authored-by: Claude Website: macOS/iOS: macOS Apple Silicon (arm64) macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED macOS Intel (x64) iOS XCFramework Linux: Ubuntu x64 (CPU) Ubuntu arm64 (CPU) Ubuntu s390x (CPU) Ubuntu x64…