Cube-view: UCIe flush against cube edges

UCIe position calculated with minimal inset (0.3 × size) to
place components flush against cube boundary edges.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/kernbench/topology/visualizer.py

@@ -724,13 +724,15 @@ def _render_cube_view_svg(view: ViewGraph, spec: dict) -> str:
         )
 
     # ── UCIe port components (position/size from topology.yaml) ──
-    # ucie_mm.size = 2.0mm, positions from _cube_local_positions
+    # ucie_mm.size = 2.0mm, positions at cube edges (flush)
     ucie_size_mm = cube.get("geometry", {}).get("ucie_mm", {}).get("size", 2.0)
+    uh_half = ucie_size_mm * 0.3  # half-height for edge placement
+    uw_half = ucie_size_mm * 0.5
     ucie_positions = {
-        "N": (cube_w / 2, ucie_size_mm / 2),          # top center
-        "S": (cube_w / 2, cube_h - ucie_size_mm / 2),  # bottom center
-        "W": (ucie_size_mm / 2, cube_h / 2),            # left center
-        "E": (cube_w - ucie_size_mm / 2, cube_h / 2),   # right center
+        "N": (cube_w / 2, uh_half),                # flush top edge
+        "S": (cube_w / 2, cube_h - uh_half),       # flush bottom edge
+        "W": (uh_half, cube_h / 2),                 # flush left edge
+        "E": (cube_w - uh_half, cube_h / 2),        # flush right edge
     }
 
     # Collect UCIe connections per direction