Gitignore build artifacts, temp files, and CLI tmp directory

Ignore compiled JS/sourcemap/declaration files in server/src,
tmp-* scratch scripts, and cli/tmp/.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -9,3 +9,11 @@ coverage/
 data/
 .paperclip/
 .pnpm-store/
+tmp-*
+cli/tmp/
+
+# Build artifacts in src directories
+server/src/**/*.js
+server/src/**/*.js.map
+server/src/**/*.d.ts
+server/src/**/*.d.ts.map