Keep port identity labels above diagram text without consuming gestures

harness/DECISIONS.md

@@ -38,3 +38,9 @@
 - Contextual actions use a controlled Iced overlay and captured semantic target plus document/revision/view context. Menus reuse existing handlers, and opening a menu does not select/apply another draft. Canvas focus scopes routing keys; Actions is an accessible alternative to right-click. Source files use a folder tree with exact paths and aggregate draft/diagnostic markers.
 - Port anchors are per-placement presentation records with four sides and normalized offsets. Automatic sides use port direction and visible peer geometry; explicit anchors do not change owner minimum dimensions. Canvas, routing, Fit and SVG share projected anchors and side normals. Graphical reparent batches old-owner anchor cleanup with semantic reparent; raw source and API remain strict and require explicit repair.
 - Direct connections use explicit Select/move and exchange palette tools. Compatible visible endpoints are highlighted; click-click or drag creates one ordinary validated command. Function-card gestures use the existing automatic port planner. Tool invocation, blank-canvas restart, Escape and model/view changes invalidate old gesture contexts. No project clone or whole-model compile occurs per highlighted candidate; final commit still validates the complete model/source change.
+- Port identity feedback is a passive stacked Canvas: Iced Frame separation alone
+  does not create GPU layering. The independent native overprint reproduction
+  established the need; input stays with the existing interactive child.
+- Each checkout uses a distinct Cargo target directory. A shared-target Linux run
+  reused a different worktree's test executable; only explicitly rebuilt main
+  results count as evidence.