feat: implement Team API API endpoints

UPGRADE.md

@@ -0,0 +1,38 @@
+# Upgrade To v2
+
+This guide covers upgrading from the latest released v1 Node SDK to v2.
+
+## Highlights
+
+- Sending email now lives behind `Lettermint.email(token)`.
+- The full Lettermint API is available through `Lettermint.api(token)`.
+- Sending tokens use `x-lettermint-token`; full API tokens use `Authorization: Bearer`.
+- `ping()` returns the raw trimmed `pong` response.
+- Request and response types are generated from the OpenAPI specs and exported from the package.
+
+## Replace Client Construction
+
+```ts
+import { Lettermint } from 'lettermint';
+
+const email = Lettermint.email(process.env.LETTERMINT_SENDING_TOKEN!);
+const api = Lettermint.api(process.env.LETTERMINT_API_TOKEN!);
+```
+
+Existing `new Lettermint({ apiToken })` email-builder usage still works for sending email.
+
+## Batch Sending
+
+```ts
+await Lettermint.email(token).sendBatch([
+  { from: 'sender@example.com', to: ['user@example.com'], subject: 'Hello', text: 'Hi' },
+]);
+```
+
+## Full API
+
+```ts
+const domains = await Lettermint.api(token).domains.list();
+const messageHtml = await Lettermint.api(token).messages.html('message-id');
+```
+

biome.json

@@ -4,7 +4,7 @@
     "enabled": true
   },
   "files": {
-    "ignore": ["package.json"]
+    "ignore": ["package.json", "coverage/**", "dist/**", "src/types.ts"]
   },
   "linter": {
     "enabled": true,