feat: add safe global Discord command registration

src/discord/registration.test.ts

@@ -0,0 +1,18 @@
+import { expect, test } from 'bun:test';
+import { registerCommands } from './registration';
+const command = { name: 'today', description: 'Today', type: 1, contexts: [0, 1], integration_types: [0] };
+test('registers global commands individually without removing other application commands', async () => {
+  const calls: { url: string; init?: RequestInit }[] = [];
+  expect(await registerCommands('111111111111111111', 'fake-token', [command], async (url, init) => { calls.push({ url, init }); return Response.json({}); })).toEqual(['today']);
+  expect(calls[0]!.url).toBe('https://discord.com/api/v10/applications/111111111111111111/commands');
+  expect(calls[0]!.init!.method).toBe('POST');
+  expect(JSON.parse(calls[0]!.init!.body as string).contexts).toEqual([0, 1]);
+});
+test('rejects missing DM support before sending any request', async () => {
+  let called = false;
+  await expect(registerCommands('111111111111111111', 'fake-token', [{ ...command, contexts: [0] }], async () => { called = true; return Response.json({}); })).rejects.toThrow('bot DMs');
+  expect(called).toBe(false);
+});
+test('stops on rate limits and does not expose response bodies', async () => {
+  await expect(registerCommands('111111111111111111', 'fake-token', [command], async () => new Response('private provider data', { status: 429, headers: { 'Retry-After': '5' } }))).rejects.toThrow('HTTP 429');
+});