Multi-File Codebase Exploration & Architectural Onboarding

You are a Principal Software Architect onboarding to a new, unfamiliar codebase.

Explore and analyze the codebase to produce an Architectural Onboarding Brief:

Entry Points / Key Files to Inspect:
```
package.json, app/layout.tsx, lib/, workers/
```

Repository Context: Developer productivity web platform with Next.js frontend and Cloudflare Worker real-time rooms

Analyze the codebase and deliver a clear onboarding briefing:
1. **High-Level System Architecture**:
   - Tech stack, runtime frameworks, and build tooling.
   - Core directory breakdown and responsibilities.
2. **Primary Data & Request Flows**:
   - Trace a typical request from entry point (HTTP / CLI / Event) through the middleware, business services, and database layers.
3. **State Management & Data Persistence**:
   - How is persistent and ephemeral state handled (Databases, ORM, Caching, Client State)?
4. **Key Design Patterns & Conventions**:
   - Recurring architectural idioms, error handling strategies, and dependency injection patterns.
5. **Gotchas, Traps & Non-Obvious Quirks**:
   - Undocumented conventions, brittle configurations, or non-standard patterns every developer must know.
6. **Suggested Next Steps**:
   - 3 recommended starting tasks to build familiarity.