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50826c0ac8
The expressiveness gap traced to vocabulary: draw.io has hundreds of shapes, the declarative layer allowed six. Opening it, with the failure modes from design review handled: - shapes.ts: a ~20-entry curated catalog (full style fragment incl. the matching perimeter — required or edges connect to the bounding box; a text-scale factor verified in the real editor — the same sentence overflows a 1.0x rhombus and fits a 1.5x one; labelOutside+glyph for umlActor-style figures). Any other token passes through verbatim: draw.io degrades unknown shapes to rectangles safely (verified). Injection-capable tokens (;/=) are rejected outright. - Pass-through emits a WARNING with a nearest-catalog hint (bounded edit distance), so a typo'd 'cyclinder' is a one-turn fix instead of a silently rectangular node forever. set_shape/set_role/set_group operations make the fix possible without remove+re-add (which would drop links). - mergeStyle(): style fragments merge per-key (later wins, bare shape classes displace each other) instead of string concatenation. This is what makes shape and theme composable by rule — shape owns geometry keys, theme owns colour/type keys, and an overlap resolves by order instead of emitting contradictory duplicates. - dai_shape marker carries the declared token through the round trip: appearance-based reverse mapping cannot distinguish aliases (diamond vs decision) or a rotated queue from a cylinder. - dai_auto marker separates engine-measured size from user-fixed size: parsed boxes no longer freeze the first layout's numbers, so changing a label re-measures. Pinned nodes keep everything, as before. - draw_graph's closed shape enum opened to match (first instance of the schema-drift problem the review predicted). 14 new tests: merge ownership, injection rejection, near-match hints, alias-preserving round trip, re-measure on label change, mxgraph.* tokens staying boxes with role/group intact. 556 unit tests green; acceptance diagram (person/hexagon/cylinder/queue/cloud/decision/callout) verified in the real editor.