Gitignore scratch scripts and seed files

Ignore check-*.mjs, new-agent*.json, newcompany.json, and seed-*.mjs
files across repo root, server/, and packages/db/.

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

.gitignore

@@ -12,6 +12,15 @@ data/
 tmp-*
 cli/tmp/
 
+# Scratch/seed scripts
+check-*.mjs
+new-agent*.json
+newcompany.json
+seed-*.mjs
+server/check-*.mjs
+server/seed-*.mjs
+packages/db/seed-*.mjs
+
 # Build artifacts in src directories
 server/src/**/*.js
 server/src/**/*.js.map