Basic cases fixed!

Author: johnnyshields

lib/minigun/hud/flow_diagram.rb

@@ -493,11 +493,11 @@ def render_fanin_connection(terminal, source_positions, to_pos, stage_data, x_of
           end
         end
 
-        # Draw final vertical line from merge point to target
-        # (Only if not already covered by a center source)
-        unless source_data.any? { |s| s[:x] == to_x }
-          terminal.write_at(x_offset + to_x, y_offset + merge_y, "│", color: color)
-        end
+        # Draw junction at the converge point (center X position)
+        # Use ┼ if there's a source directly above, ┬ if not
+        has_center_source = source_data.any? { |s| s[:x] == to_x }
+        junction_char = has_center_source ? "┼" : "┬"
+        terminal.write_at(x_offset + to_x, y_offset + merge_y, junction_char, color: color)
       end
 
       # Draw animated connection line between two boxes

spec/hud/diagrams/flow_diagram_rendering_spec.rb

@@ -140,7 +140,7 @@ def normalize_output(buffer)
 │  ◀ path_b  │  │  ◀ path_a  │
 └────────────┘  └────────────┘
        │               │
-       └────┐     ┌────┘
+       └───────┬───────┘
         ┌────────────┐
         │  ◀ merge   │
         └────────────┘
@@ -235,6 +235,7 @@ def normalize_output(buffer)
                 ┌────────────┐
                 │  ▶ source  │
                 └────────────┘
+                       │
        ┌───────────────┼───────────────┐
 ┌────────────┐  ┌────────────┐  ┌────────────┐
 │   ◀ slow   │  │ ◀ process  │  │   ◀ fast   │
@@ -245,7 +246,7 @@ def normalize_output(buffer)
        │        │ ◀ process2 │         │
        │        └────────────┘         │
        │               │               │
-       └────────────┐  │  ┌────────────┘
+       └───────────────┼───────────────┘
                 ┌────────────┐
                 │  ◀ final   │
                 └────────────┘