[mstan]

Adds the Player 2 Learner Mode mod (megaman-x.coop.learner, off by default) and releases 2.3.8.

• P2 loses no health and never dies: enemy contact ($84:9D50) and hurt ($84:9F42) damage is zeroed, the death controller becomes a rescue, and pits, fatal states or two seconds off P1's screen beam P2 back beside P1 without freezing the world.
• P1 alone drives the camera, doors, pause, Ride Armor and the stage; P1's death is a one-life team restart.
• Its own mod that requires co-op (snesrecomp #220 requires), with a "Show Player 2 health bar" option, hidden by default.
• Engine pinned to snesrecomp main 267ff24; recomp-ui at latest master 3f1d6f1.

Tests: MMX_COOP_LEARNER_TEST (both rosters, HUD in both layouts), the co-op launcher check with the real plugin, the natural-death/join/keyboard/follow-up co-op suites, and all 35 ctests pass (Saber wave skips without an X3 ROM). Not yet covered by fixtures: doors, Ride Armor, capsules and story scenes with a learner.

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