fix: default vson dimensions so vson8 renders from a bare name

src/fn/vson.ts

@@ -12,21 +12,29 @@ import { dim2d } from "src/helpers/zod/dim-2d"
 import { type SilkscreenRef, silkscreenRef } from "src/helpers/silkscreenRef"
 import { createRectUnionOutline } from "src/helpers/rect-union-outline"
 
-// can't use defaults because there is not a lot of common dimensions.
+// Defaults describe the canonical KiCad VSON-8-1EP 3x3mm 0.65mm-pitch part
+// (Package_SON VSON-8-1EP_3x3mm_P0.65mm_EP1.65x2.4mm) so a bare `vsonN` renders
+// instead of throwing a raw parse error; pass explicit dims to override for a
+// specific part. The exposed pad is left at 0 so a bare `vson8` stays 8 pads;
+// add `ep` for a part that needs the thermal pad.
 export const vson_def = base_def.extend({
   fn: z.string(),
   num_pins: z.number().optional().default(8),
-  p: distance.describe("pitch (distance between center of each pin)"),
-  w: length.describe("width between vertical rows of pins"),
-  grid: dim2d.describe("width and height of the border of the footprint"),
+  p: distance
+    .default("0.65mm")
+    .describe("pitch (distance between center of each pin)"),
+  w: length.default("2.9mm").describe("width between vertical rows of pins"),
+  grid: dim2d
+    .default("3x3mm")
+    .describe("width and height of the border of the footprint"),
   ep: dim2d
     .default("0x0mm")
     .describe("width and height of the central exposed thermal pad"),
   epx: length
     .default("0mm")
     .describe("x offset of the center of the central exposed thermal pad"),
-  pinw: length.describe("width of the pin pads"),
-  pinh: length.describe("height of the pin pads"),
+  pinw: length.default("0.85mm").describe("width of the pin pads"),
+  pinh: length.default("0.35mm").describe("height of the pin pads"),
 })
 
 export type VsonDefInput = z.input<typeof vson_def>