My values for commuting bike geometry are very similar to those for proper touring bikes...

• somewhat slack angles
• decent chainstay length (for longitudinal stability, and more importantly, good weight distribution and avoidance of heelstrike with panniers)
• fork trail conducive to carrying reasonable cargo load on the front

Not geometry per se, but added to the above, a reasonably stiff and sturdy frame/fork to carry the load with stability and deal with road hazards over the long haul; and braze-ons for fenders and racks front & back, as well as cantis.