perf: harden runtime for weaker hardware

docs/local_quality_gate.md

@@ -190,3 +190,16 @@ portable watchdog on stock macOS as well as Linux/Windows, and nonzero
 `gdformat`/`gdlint` exits fail the gate even when their output is not a familiar
 diagnostic string. Import receives a 60-second timeout on both shell and
 PowerShell; the focused checks retain their 30-second timeout.
+
+Scenario logs are also classified after successful process exits. Unexpected
+`ERROR:`, `SCRIPT ERROR:`, and `WARNING:` headers fail the gate and name their
+originating scenario. The only narrow platform/vendor exceptions are the
+isolated-profile macOS certificate-store condition, Terrain3D 1.0.2's Godot 4.7
+interpolation deprecation, and the dummy renderer's exact one-`DummyShader` RID
+exit report. Different warning text, leak counts, or RID types remain failures;
+the full unfiltered output stays in `logs/quality/latest/scenarios.log`.
+
+The scenario stage also runs the presentation-quality contract once with
+`--rendering-method gl_compatibility`. This catches unsupported feature toggles
+and profile-selection regressions; because the gate is headless, it is not a
+substitute for a rendered OpenGL frame-time capture on representative hardware.