feat: add terminal demo SVG to README hero section

Generated with rich's SVG export - renders natively on GitHub with
proper syntax highlighting and colors. Shows the three key workflows
in one image: ccs search with numbered results, ccs go to resume,
and team mode (log + standup). Placed between tagline and install
command so it's the first thing visitors see.

Author: bluzername

README.md

@@ -11,6 +11,10 @@
 
 A curated toolkit that gives [Claude Code](https://docs.anthropic.com/en/docs/claude-code) persistent memory, cross-project search, structured planning, and session management - so you never repeat work across projects.
 
+<p align="center">
+  <img src="assets/demo.svg" alt="ccs demo - search, resume, team mode" width="700">
+</p>
+
 ```bash
 curl -fsSL https://raw.githubusercontent.com/bluzername/claude-code-power-stack/main/setup.sh | bash
 ```