v1.1.6

Fixed

• PERT dependencies meet the visible milestone diamond boundary, with separate
  incoming arrows and clear routing past intermediate activities.
• Logic MUXes use a trapezoid with data inputs on the left and select entering
  from below. Module frames leave room for pins and captions, and the canvas
  crops unused space above the circuit.
• Block feedback shares a single forward output wire with a takeoff dot beyond
  the block. Return sensors carry signals right-to-left into the summing input.
• Website PNG rendering embeds Unicode font subsets covering generated renderer
  symbols, including arrows, Greek letters, combining overlines and math signs.
  Critical paths retain real arrows. Regression coverage checks emitted text
  against the font character maps across the documented examples.