feat(games): add the generic d6 oracle game package

Serves as the reference implementation of the game package contract:
rules, spark tables, character backgrounds, and an example command.

games/generic/index.js

@@ -0,0 +1,31 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { parseTable, rollTable } from '@solo/oracle';
+
+const HERE = path.dirname(fileURLToPath(import.meta.url));
+
+/** Roll a starting background from characters/backgrounds.csv. */
+function background() {
+  const file = path.join(HERE, 'characters', 'backgrounds.csv');
+  const entries = parseTable(fs.readFileSync(file, 'utf8'));
+  const { roll, entry } = rollTable(entries);
+  const tags = entry.tags.length ? `  [${entry.tags.join(', ')}]` : '';
+  console.log(`background  roll ${roll} → "${entry.text}"${tags}`);
+}
+
+/**
+ * A game package's default export is its manifest. See docs/games.md.
+ */
+export default {
+  id: 'generic',
+  title: 'Generic d6 Oracle',
+  description: 'System-agnostic solo play driven by the d6 oracle and spark tables.',
+  rules: 'game.md',
+  commands: {
+    background: {
+      description: 'Roll a starting character background.',
+      run: background,
+    },
+  },
+};