Based on thorough code review, fixes all identified issues:
1. **Y-offset root cause**: Added post-layout normalization that shifts
all positioned nodes and edges so the bounding box starts at (0,0).
ELK can place nodes at arbitrary positions within its root graph;
normalizing compensates regardless of what ELK computes internally.
2. **Bounding box**: Compute from recursively flattened node tree +
edge point bounds. Removes double-counting of compound children
(children have absolute coords, not relative to parent).
3. **SVG double-drawing**: Compound children were drawn both inside
drawCompoundContainer and again in the allNodes loop. Now collects
compound child IDs and skips them in the second pass.
4. **findNode**: Now recurses into children for nested compound lookup.
5. **colorForType**: Removed redundant double-check on EIP_TYPES.
6. **Dead code removed**: routeNodeMap/indexNodeRecursive (populated but
never read), MIN_NODE_WIDTH/CHAR_WIDTH/LABEL_PADDING (unused).
7. **Static initialization**: LayoutMetaDataProvider registration moved
from constructor to static block (runs once, not per instance).
8. **Debug logging removed**: Removed diagnostic System.out.println.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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