Give the stroke pattern one mode and design.yaml tuning

The twelve experimental modes collapse to camera_compensated_width, whose ten
knobs now come from a `stroke_pattern` block, and the PNG-only binary-preview
command goes with them as a strict subset of stroke-texture.

Verified: output is byte-identical at the defaults against the previous code, a
knob change is visible in the artifacts, the suite is green and the doc gate is
clean.

README.md

@@ -230,9 +230,9 @@ blender -b sensors/finger/r01/source/geometry.blend -P blender/scripts/random_pa
 `stroke-texture` exports Random Stroke Pattern (RSP) PNG/SVG/PDF and a hash
 manifest from existing color artwork, for example:
 `orisys-design stroke-texture sensors/finger/r01 --views`. Outputs go to a
-`strokes` subdirectory; `--output-dir` selects another. `binary-preview`
-remains PNG-only. Nominal stroke width is 0.11–0.28 mm; verify vectors and
-printed dimensions before manufacturing.
+`strokes` subdirectory; `--output-dir` selects another. Tuning lives in the
+revision's `stroke_pattern` block. Nominal stroke width is 0.11–0.28 mm;
+verify vectors and printed dimensions before manufacturing.
 
 ## Inspect printability (advisory)