Add OpenForge README graphic

Author: Greyforge Admin

README.md

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 # PCAM-24  
 ## Phase-Centric Action Model for Deterministic Interactive Simulation
 
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+  <img src="docs/assets/openforge-pcam-24.webp" alt="PCAM-24 OpenForge project artwork" width="720">
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 PCAM-24 is a **phase-first simulation model** for interactive systems (games, training simulations, real-time agents) in which **discrete phase—not time—is the authoritative coordinate** for action progression, interaction adjudication, and cross-system synchronization.
 
 Rather than asking *“how much time has passed?”*, PCAM-24 asks:
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 *PCAM-24 is a proposal to rethink how interactive actions are represented, reasoned about, and synchronized—not by time, but by stage.*
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