- core: decouple drag-follow from distributionRole — add
portConnectivityFollow flag to NodeDefinition; pipe-trap opts out
(portConnectivityFollow: false) so dragging a connected pipe endpoint
stretches the trap arm instead of yanking the anchored trap fixture
- core: remove the module-level getLevelHeight cache entirely — it was
keyed only by nodes-object identity, which could return stale heights
for in-place mutations by pure/headless callers. The function is now
fully pure and deterministic; viewer hot path recomputes per frame as
before (the cache only ever skipped the resolver-free branch)
- test: harden port-connectivity-pipe.test.ts — real DuctSegmentNode
cross-family isolation case (was waste-vs-vent), new pipe-trap anchor
case (run drag doesn't move trap; trap drag still stretches run), and
beforeEach/afterEach registry reset instead of leaky beforeAll
- nit: biome format/import-order on all touched files
Open Pascal
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