Take the icon sheet's base-forme slots from a generated dex table

ps-pokemon.sheet.mjs reads entry.num out of data/species.json to place a
base species on the sheet, which is the last thing in the build that
needs a number from that table. Move it to ps-pokemon.dexnums.mjs,
generated from pokemon-showdown alongside the hand-kept alt-forme index
table the file already carries.

The sheet is nameSensitive and rebuilt: pokemonicons-sheet.png hashes
the same before and after, and all three deploys materialize byte for
byte identically.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MQicnpaee6kQXGG7uVExLS

tools/spritedata/dexnums.ts

@@ -0,0 +1,36 @@
+import {createRequire} from 'node:module';
+import * as path from 'node:path';
+
+// Regenerates ps-pokemon.dexnums.mjs from a pokemon-showdown checkout:
+//
+//   node tools/spritedata/dexnums.ts ~/smogon/pokemon-showdown > ps-pokemon.dexnums.mjs
+//
+// The PS icon sheet puts a base species at the slot named by its dex number,
+// and only alt formes need the hand-kept index table in ps-pokemon.sheet.mjs.
+
+type PokedexEntry = {
+    num: number,
+    name: string,
+    baseSpecies?: string
+};
+
+let ps = process.argv[2];
+if (!ps) {
+    throw new Error('usage: node tools/spritedata/dexnums.ts <pokemon-showdown checkout>');
+}
+
+let require = createRequire(import.meta.url);
+let {Pokedex} = require(path.resolve(ps, 'dist/data/pokedex.js')) as
+    {Pokedex: Record<string, PokedexEntry>};
+
+let out = '';
+out += '// Generated by tools/spritedata/dexnums.ts; do not edit.\n';
+out += '// PS id of every base species -> its national dex number.\n\n';
+out += 'export const DEX_NUMS = {\n';
+for (let {num, name, baseSpecies} of Object.values(Pokedex)) {
+    if (baseSpecies) continue;
+    out += `\t${name.toLowerCase().replace(/[^a-z0-9]+/g, '')}: ${num},\n`;
+}
+out += '};\n';
+
+process.stdout.write(out);