Expose simplify in the Python and Node bindings

Config(simplify=...) / property in Python; simplify option in Node,
with the tolerance documented in .pyi, index.d.ts, and both READMEs.
The Node README's option list also catches up with the clustering
rename and the binary/watershed options, and test.js drops the stale
colorMode key (silently ignored since the rename, so its bw assertion
was testing the default path) and asserts simplify shrinks output.

crates/vtracer-py/README.md

@@ -51,10 +51,11 @@ properties, plus the presets `Config.bw()`, `Config.poster()`, `Config.photo()`:
 | `length_threshold` | `4.0` | px |
 | `max_iterations` | `10` | |
 | `splice_threshold` | `45` | degrees |
+| `simplify` | `None` | curve simplification tolerance in px (try 1–2.5) |
 | `path_precision` | `2` | output decimal places |
 | `palette` | `None` | list of `#rrggbb` strings |
 | `max_colors` | `None` | auto-quantize target |
-| `optimize` | `1` | `0` off, `1` quantize+simplify, `2` + shorthands |
+| `optimize` | `1` | `0` off, `1` quantize+cleanup, `2` + shorthands |
 | `binary_threshold` | `128` | bw: fixed cutoff, foreground below it |
 | `adaptive` | `False` | bw: Bradley–Roth adaptive thresholding |
 | `adaptive_window` | `0` | bw adaptive: window px (`0` = auto) |

crates/vtracer-py/src/lib.rs

@@ -140,6 +140,7 @@ impl PyConfig {
         length_threshold = 4.0,
         max_iterations = 10,
         splice_threshold = 45,
+        simplify = None,
         path_precision = 2,
         palette = None,
         max_colors = None,
@@ -162,6 +163,7 @@ impl PyConfig {
         length_threshold: f64,
         max_iterations: usize,
         splice_threshold: i32,
+        simplify: Option<f64>,
         path_precision: u32,
         palette: Option<Vec<String>>,
         max_colors: Option<usize>,
@@ -188,8 +190,7 @@ impl PyConfig {
                 length_threshold,
                 max_iterations,
                 splice_threshold,
-                // Curve simplification is not surfaced in the Python API yet.
-                simplify: None,
+                simplify,
                 path_precision: Some(path_precision),
                 palette,
                 max_colors,
@@ -331,6 +332,15 @@ impl PyConfig {
         self.inner.splice_threshold = v;
     }
 
+    #[getter]
+    fn simplify(&self) -> Option<f64> {
+        self.inner.simplify
+    }
+    #[setter]
+    fn set_simplify(&mut self, v: Option<f64>) {
+        self.inner.simplify = v;
+    }
+
     #[getter]
     fn path_precision(&self) -> Option<u32> {
         self.inner.path_precision

crates/vtracer-py/vtracer.pyi

@@ -18,6 +18,7 @@ class Config:
         length_threshold: float = 4.0,
         max_iterations: int = 10,
         splice_threshold: int = 45,
+        simplify: Optional[float] = None,   # curve simplification tolerance in px (None = off)
         path_precision: int = 2,
         palette: Optional[list[str]] = None,   # e.g. ["#112233", "#445566"]
         max_colors: Optional[int] = None,      # auto-quantize target
@@ -46,6 +47,7 @@ class Config:
     length_threshold: float
     max_iterations: int
     splice_threshold: int
+    simplify: Optional[float]
     path_precision: Optional[int]
     palette: list[str]
     max_colors: Optional[int]