Complete KQVI chart overhaul: SVG rendering, pawn shop simplification, and cleanup

- Add build.sh wrapper script for SVG rendering via mermaid-cli
- Simplify pawn shop: remove trade chain, show items as UNLOCKED directly
- Add documented color palette for repeat areas
- Fix 16 orphaned nodes (input/output connectivity issues)
- Apply bigger subgraph titles (18px for Final Confrontation)
- Ensure only START/END outside subgraph groupings

Build: ./build.sh (not mdbook build)

scripts/render-mermaid.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+set -e
+
+MMDC="/home/noti/.nvm/versions/node/v22.17.1/bin/mmdc"
+SRC_DIR="src/inspiration"
+
+echo "Rendering Mermaid charts to SVG..."
+
+"$MMDC" -i "$SRC_DIR/kings-quest-vi-chart.mmd" -o "$SRC_DIR/kings-quest-vi-chart.svg" -w 1600
+
+echo "Done."