Feature: Corporation automation (BN3)

[UnderMyBed]

Problem: Zero corporation code exists. BN3 is completely skipped. Corporations can generate effectively infinite money, trivializing other mechanics in some BitNodes.

There's a 4-year-old PR (alainbryden#59 upstream) with corporation management code, but it likely needs a full rewrite for current game APIs.

Fix: Build corp.js that automates corporation creation, industry expansion, employee management, product development, and profit optimization. Integrate with autopilot for BN3 and BN11.