all of the changes

verification/OPTIMIZATION.md

@@ -29,9 +29,9 @@ tolerance; long engine/audio traces need not be bit-identical to the reference.
 
 A `-pg` build running every scenario for two simulated seconds attributed about
 39% of sampled executable time to pipe advancement, 38% to orifice boundary
-solves, and 13% to Solver::step (including inlined preparation). Turbo mechanics
-were under 1% and outdoor emitter rendering about 1%. These are sampled gprof
-results, not precise attribution of time inside dynamically linked math functions.
+solves, and 13% to Solver::step (including inlined preparation). Outdoor emitter
+rendering was about 1%. These are sampled gprof results, not precise attribution
+of time inside dynamically linked math functions.
 
 `fluidsim_thread_benchmark` now uses each scenario's actual pipe geometry and
 compares persistent 1/2/4-worker execution with barriers per substep. This isolates
@@ -52,7 +52,6 @@ Mean wall seconds per simulated second, six-second sustained-load runs:
 | Scenario | Reference | Optimized | Time reduction | SIMD disabled |
 |---|---:|---:|---:|---:|
 | Twin | .528 | .405 | 23% | .423 |
-| Turbo twin | 1.368 | .649 | 53% | .684 |
 | B205 | .884 | .689 | 22% | .737 |
 | Two-stroke racing | .561 | .470 | 16% | .535 |
 | Two-stroke straight | .539 | .464 | 14% | .525 |
@@ -60,7 +59,7 @@ Mean wall seconds per simulated second, six-second sustained-load runs:
 | Pulse | .256 | .238 | 7% | .315 |
 
 Idle/transient optimized means (seconds per simulated second): twin .394/.399,
-turbo .627/.651, B205 .666/.683, racing two-stroke .450/.459, straight two-stroke
+B205 .666/.683, racing two-stroke .450/.459, straight two-stroke
 .452/.453, Helmholtz .141/.140, and pulse .238/.238.
 
 The pulse scenario has no orifice, so its improvement isolates the SIMD-friendly
@@ -69,7 +68,7 @@ native-instruction build improves some timings further, but is not shipped as
 the default: FMA also changes rounding and the binary is CPU-specific.
 
 Initial isolated changes measured approximately .40 seconds for the twin after
-boundary warm starts alone (previously .53). The sustained turbo still took
+boundary warm starts alone (previously .53). The sustained high-load scenario still took
 about 1.2 seconds after that change; eliminating subnormal tracer tails brought
 it to about .65. The diagnostic found 22 subnormal pipe fields before truncation
 and zero afterwards. This is distinct from reducing CFL substeps or geometry;
@@ -79,8 +78,9 @@ performance for every user configuration or arbitrarily long simulation.
 
 ## Reproduction
 
-Final validation: all nine CTest suites passed both with SIMD enabled (28.50 s)
-and disabled (30.86 s). The fluid validation executable includes 30 checks,
+Final validation at the time of this audit: all nine then-registered CTest
+suites passed both with SIMD enabled (28.50 s) and disabled (30.86 s). The
+fluid validation executable includes 30 checks,
 including tracer underflow conservation. The Release SFML desktop target also
 rebuilt successfully. This audit verifies desktop compilation and headless audio
 rendering; interactive playback underrun testing remains a separate user check.
@@ -95,12 +95,12 @@ ctest --test-dir build-opt --output-on-failure
 ./build-opt/fluidsim_thread_benchmark
 ```
 
-The scenario benchmark runs twin, turbo twin, B205, racing and straight-pipe
+The scenario benchmark runs twin, B205, V8, racing and straight-pipe
 two-strokes, Helmholtz and pulse scenarios, including their normal audio path.
 `loaded` holds four-strokes at 7,000 RPM and two-strokes at 10,000 RPM using an
 ideal speed-holding dyno; engine throttle is 70%. `idle` releases the pedal;
 `transient` starts released, applies 70%, then releases for the last two seconds.
-The optional final argument selects one scenario, e.g. `6 loaded turbo`.
+The optional final argument selects one scenario, e.g. `6 loaded v8`.
 CSV timing/checksum goes to stdout; subnormal and iteration diagnostics go to
 stderr. Inspection happens outside the timed sample-processing loop.