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Red blue doors

RedBlueDoors (issue #172): a single room split by one dividing wall into two chambers, with a red and a blue Door both embedded in that same wall (at two distinct rows) - both reachable from the left chamber alone, no need to ever cross into the right one. Reward + termination on opening blue while red is already open; opening blue first ends the episode with no reward.

Deliberately simplified from MiniGrid's actual RedBlueDoorEnv._gen_grid (checked directly, after PR #191's review caught an earlier, incorrect claim of an exact match here): real MiniGrid places the agent in a third, middle chamber, with red and blue on two different walls leading to two separate outer chambers, not one shared wall - but since toggle only needs the player adjacent-and-facing a door (never actually walking through one), and termination fires the instant blue opens (before either outer chamber could ever be reached), the two layouts are behaviourally indistinguishable through gameplay: order, not position, is all that determines success either way.

Bases: Environment

Navix-RedBlueDoors-*. One room, a dividing wall holding a red and a blue Door (both reachable from the start side). Success is opening the blue door after the red one is already open; opening blue first ends the episode with no reward. The task is about ordering, not navigation.