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d9cdfba3e1
Arrowheads carry meaning: a crow's foot IS one-to-many, a hollow diamond IS aggregation. The engine allowed exactly one arrowhead; this opens the vocabulary the same way shapes were opened: - LinkSpec gains head/tail (pass-through to endArrow/startArrow, charset- gated against style injection) and headFill/tailFill — fill is written explicitly whenever a head is declared, because UML composition and aggregation differ ONLY by fill and draw.io's per-head default would flip the meaning. bold (4px amber, for THE key relationship) included. - Parallel edges: a second link between the same pair is allowed when it carries an id (ER's 'places' and 'cancels' between the same two entities); without one it stays an error, since two identical overlapping lines is a mistake. Edge ids are also what later operations address. - Sequence messages respect a declared head (an async message's open arrow is UML notation) while defaulting to the solid block as before. - draw_graph's edge schema extended to match; GraphEdge passes the new fields through to the link operations it generates. 5 new tests: crow's foot style emission, hollow-vs-filled round trip, injection rejection, parallel-edge gating, bold round trip. 561 unit tests green. ER+UML acceptance diagram (crow's foot, zero-to-one, hollow inheritance triangle, filled composition diamond) verified in the real editor.