HIP: accelerate PSF accumulation and restore parallel producers

Cooperate across 32 lanes per PSF and use two completion-protected staging slots with complete batch timing. Restore coarse OpenMP event production while serializing shared GPU submissions and direct fallback boundaries.

Add bounded benchmarks, streaming and renderer regressions, and preserve validation evidence and ownership documentation.

benchmarks/hip_psf_2026-09-07/metadata.log

@@ -0,0 +1,31 @@
+{
+  "base_commit": "265d7b95d5b916ec4768d174d73ad963a43f0088",
+  "optimized_source": "uncommitted worktree changes",
+  "compiler": "HIP version: 7.2.53210-9999\nclang version 22.1.8\nTarget: x86_64-pc-linux-gnu\nThread model: posix\nInstalledDir: /usr/lib/llvm/22/bin\nConfiguration file: /etc/clang/22/x86_64-pc-linux-gnu-clang++.cfg",
+  "hip_config_version": "7.2.53210-9999",
+  "kernel": "Linux 6.18.41-gentoo",
+  "cpu": [
+    "CPU(s):                                  16",
+    "Model name:                              12th Gen Intel(R) Core(TM) i7-12700K",
+    "Thread(s) per core:                      2",
+    "Core(s) per socket:                      8",
+    "NUMA node0 CPU(s):                       0-15"
+  ],
+  "OMP_NUM_THREADS": 16,
+  "catalog_workers": 4,
+  "hip_flags": "--offload-arch=gfx1201 -std=c++17 -O2 -Wall -Wextra -Wpedantic",
+  "cpu_flags": "-std=c11 -march=native -pipe -Wall -Wextra -Wpedantic -O2 -DNDEBUG -fopenmp",
+  "event_bytes": 56,
+  "event_capacity": 16384,
+  "device_staging_slots": 2,
+  "sha256": {
+    "src/frame.c": "338d24eaa89d2d4c1e5a7f34d08ca827db13bb79ac3a6caeb155a731390ab023",
+    "src/hip_psf.hip": "b93fed04034a97e1eb25f3fc234da995287bf0c3fcde50609f95b0b3f4052a75",
+    "src/hip_psf.h": "00502f3d95c30d4c3d346e49dcf0e3cb846b5d461c2bfd5b3f24c7257791fad0",
+    "tests/benchmark_hip_psf.hip": "56cccf515b66762acb824556681c9f6986c0ffe3e3346eeadac23bc6d5926aa4",
+    "build/Release/schwarzschild_sky_hip": "1c340e1d8ab008e892101b46132069255ab92eb0d200bd91b2b300a4f4dacf6e",
+    "/tmp/gr-schwarzschild-hip-baseline": "de945e3dc826d559e1f8218a56d24f524c06e5382c8aa43667f9ac1fe5d2d719",
+    "/tmp/gr-hip-baseline-src/build/Release/schwarzschild_sky_hip": "de945e3dc826d559e1f8218a56d24f524c06e5382c8aa43667f9ac1fe5d2d719",
+    "output/lens/schwarzschild_galactic_center_R100_45deg_16_4_4k_.grlens": "905f960aea2d276f9586c79fba545a72cf742311e9e7e18faea293835c68bf28"
+  }
+}