Profiler: real-GPU breakdown by zoom, look and scene, with a baseline (t88 phase 0)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/agent-log.md

@@ -4,6 +4,23 @@ What agents have done, newest first. Add an entry for every piece of work: the d
 note or request it was for, what changed, the files touched, the tests run, and anything left
 open or not verified. Keep each entry short; the git history has the details.
 
+## 2026-10-27: t88 phase 0, profiler and baseline (Claude Code + Codex)
+
+- `tools/perf.py` rewritten: real GPU (ANGLE Vulkan flags), served by the new `tools/server.py`
+  with COOP/COEP (`tools/serve.py` sends them too), zooms 12/6/4/3/2 x pixel/smooth x scenes
+  settled/factory/heat (`tools/perf-scenes.js`), drawWorld split by `PERF_MARKS`, per-step sim
+  timings, 10 s real runs with p50/p95/p99, `--json`/`--compare`. Baseline `tools/perf-baseline.json`.
+  In-game perf readout shows world, light, overlays, move, heat, rest (`src/ui/perf.js`).
+- Baseline (1920x1080, RTX 5070): zoom 2 smooth heat scene drawWorld 27.4 ms (colour loop 21.1,
+  light 5.5, upload 0.6); sim 3.7-4.9 ms/tick (simMove 2.0-2.3, heatPass 1.5-2.6); real loop at
+  zoom 2 runs at 30 fps (CPU work p50 30-37 ms), at zoom 6 at 60 fps (7-9 ms).
+- Files: `tools/perf.py`, `tools/server.py`, `tools/serve.py`, `tools/perf-measure.js`,
+  `tools/perf-scenes.js`, `tools/test_perf.py`, `tools/perf-baseline.json`, `src/ui/perf.js`,
+  `src/render/world.js`, `src/render/smooth.js`, `src/ui/loop.js`, `src/styles/style.css`,
+  `src/manifest.json`, `test/t_perf.js`, `docs/TESTING.md`, `docs/PROJECT_MAP.md`.
+- Tests: `python3 test/run_all.py --browser` all passed. Not measured yet: GPU time (timestamp
+  queries come with WebGPU), Firefox.
+
 ## 2026-10-27: OS pointer hidden over the game (Claude Code)
 
 - The canvas used `cursor: crosshair`, so the system pointer showed on top of the game's own aim;