feat(forge): add Forge tracked channel strip

One note tracker reads the input and Lathe, Temper and Knurl follow it as
modules, in any of six orders, each on or off. Every module gets the
tracker's events delayed by the latency of the modules in front of it.

- One module alone matches its standalone plugin sample for sample in
  every order.
- With Knurl's sub-octave pattern in front, Lathe in Forge follows the
  played note; a standalone Lathe after Knurl reads it an octave low.
- About 72 ms latency against about 206 ms for the three in a row.

The module pages reuse the standalone editors. Register Forge in the
catalog, CI, README, docs and website, and drop the built Ballast from
the site's idea list.

website/src/data/plugins.ts

@@ -229,6 +229,21 @@ const COPY: Record<string, Copy> = {
     latency: '≈ 172 ms',
     tracksNotes: true,
   },
+  forge: {
+    role: 'Tracked channel strip',
+    metal: 'A forge is the hearth where every piece is heated and worked.',
+    problem:
+      'Lathe, Temper and Knurl in a row each run their own tracker: the lookaheads add up to over 200 ms, and a tracker after Knurl hears its sub-octave and follows the wrong note.',
+    points: [
+      'One note tracker reads the input; Lathe, Temper and Knurl follow it as modules.',
+      'Any order, each module on or off, one latency of about 72 ms.',
+      'Every module sounds exactly like its standalone plugin.',
+      'The module pages are the standalone editors.',
+    ],
+    loadOn: 'Bass, after the synth',
+    latency: '≈ 72 ms',
+    tracksNotes: true,
+  },
 };
 
 export interface Plugin extends Copy {
@@ -273,11 +288,6 @@ export const PLUGINS: Plugin[] = Object.entries(catalog).map(([slug, entry]) =>
 
 /** Ideas from docs/ideas.md that are not built yet. */
 export const IDEAS: { name: string; role: string; text: string; texture?: boolean }[] = [
-  {
-    name: 'Ballast',
-    role: 'Switch-up loudness leveller',
-    text: 'Measures perceived loudness per switch-up and sets gain only, so every patch lands at the same loudness without compression.',
-  },
   {
     name: 'Gauge',
     role: 'Low-end mono check',