Expand GOAL.md with Paperclip vision and mission statement

Rewrite the project goal from a single sentence to a full vision document
articulating Paperclip as infrastructure for autonomous AI companies at scale.

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

doc/GOAL.md

@@ -1,6 +1,14 @@
 # Paperclip
 
-Build software to manage a zero-human company where all employees are AI agents.
+**Paperclip is the backbone of the autonomous economy.** We are building the infrastructure that autonomous AI companies run on. Our goal is for Paperclip-powered companies to collectively generate economic output that rivals the GDP of the world's largest countries. Every decision we make should serve that: make autonomous companies more capable, more governable, more scalable, and more real.
+
+## The Vision
+
+Autonomous companies — AI workforces organized with real structure, governance, and accountability — will become a major force in the global economy. Not one company. Thousands. Millions. An entire economic layer that runs on AI labor, coordinated through Paperclip.
+
+Paperclip is not the company. Paperclip is what makes the companies possible. We are the control plane, the nervous system, the operating layer. Every autonomous company needs structure, task management, cost control, goal alignment, and human governance. That's us. We are to autonomous companies what the corporate operating system is to human ones — except this time, the operating system is real software, not metaphor.
+
+The measure of our success is not whether one company works. It's whether Paperclip becomes the default foundation that autonomous companies are built on — and whether those companies, collectively, become a serious economic force that rivals the output of nations.
 
 ## The Problem