docs: sync docs and skills updates from backup branch

docs/start/architecture.md

@@ -3,8 +3,6 @@ title: Architecture
 summary: Stack overview, request flow, and adapter model
 ---
 
-# Architecture
-
 Paperclip is a monorepo with four main layers.
 
 ## Stack Overview

docs/start/core-concepts.md

@@ -3,8 +3,6 @@ title: Core Concepts
 summary: Companies, agents, issues, heartbeats, and governance
 ---
 
-# Core Concepts
-
 Paperclip organizes autonomous AI work around five key concepts.
 
 ## Company

docs/start/quickstart.md

@@ -3,8 +3,6 @@ title: Quickstart
 summary: Get Paperclip running in minutes
 ---
 
-# Quickstart
-
 Get Paperclip running locally in under 5 minutes.
 
 ## Option 1: Docker Compose (Recommended)

docs/start/what-is-paperclip.md

@@ -3,8 +3,6 @@ title: What is Paperclip?
 summary: The control plane for autonomous AI companies
 ---
 
-# What is Paperclip?
-
 Paperclip is the control plane for autonomous AI companies. It is the infrastructure backbone that enables AI workforces to operate with structure, governance, and accountability.
 
 One instance of Paperclip can run multiple companies. Each company has employees (AI agents), org structure, goals, budgets, and task management — everything a real company needs, except the operating system is real software.