feat: add ER diagram support with crow's foot cardinality#117
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Add `erDiagram` as a graph-family diagram type with full text and SVG rendering support. Parser: hand-written line-oriented parser for entities, typed attributes (PK/FK/UK keys, quoted comments), and relationships with cardinality notation (||, o|, }|, }o) and identifying/non-identifying line types. Graph IR: extend Arrow enum with 4 crow's foot variants (OnlyOne, ZeroOrOne, OneOrMore, ZeroOrMore) — the only IR change needed across the entire diagram-type parity effort. Rendering: SVG crow's foot markers using quadratic Bézier curves for the fork notation. Text mode uses head/tail labels for cardinality. Entities render as 2-compartment nodes (name + attributes) using the existing SEPARATOR pattern from class diagrams. Closes #101
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Summary
erDiagramas a graph-family diagram type with text and SVG renderingArrowenum with 4 crow's foot cardinality variants (OnlyOne,ZeroOrOne,OneOrMore,ZeroOrMore) — the only graph IR change across the entire diagram-type parity effortSEPARATORpatternCloses #101
Test plan
just lintcleanjust architecture-checkcleanecho 'erDiagram\n CUSTOMER ||--o{ ORDER : places' | cargo run