chore: add Claude Code configuration (#2)

.gitignore

@@ -55,3 +55,15 @@ report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
 
 # Prisma client (regenerated by `prisma generate`, run on npm install)
 /prisma/generated/
+
+# AI agent skills installed from skills-lock.json (keep skills-lock.json committed)
+/.agents/
+/.windsurf/
+/.claude/skills/
+# Claude Code personal settings (.claude/settings.json stays shareable)
+/.claude/settings.local.json
+
+# Postman (skills fetched by `postman init`, personal workspace binding)
+/postman/
+/.postman/
+/AGENTS.md