Add the 6th and final core diagram type: flowcharts with standard
ISO 5807 shapes (process, decision, terminal, I/O, subprocess),
orthogonal edge routing with decision outcome labels, and ELK
layered auto-layout.
Code review fixes included: decision diamond ELK height corrected
(80→130px), icon rendering made conditional, data.color border
override added to all nodes, ELK sizing ternary refactored to
getNodeDimensions() helper, constants unified to lookup maps.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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