Hybrid ports wave 3: the move player, travel, turns and walls, lane screenshots

[sp00ktober]

Wave 3 of hybrid ports: a ported monster plays its own moves, with our attacks, travel, turns and wall stops, and hands back to the host's AI; plus screenshots from a hidden lane. For sp00ktober/MHFU-ModKit#102, #103.

• Move player (framework, mhfu move play, Lua mhfu.move_*): a C step on em_vhook's slot 29 plays an executor entry on all parts, riding em75's alert hub (0,2). Our attacks spawn at an authored clip frame and end at another (the engine's own end state). The host's animation events (slot 30: its entry-keyed attacks and effects) are muted while a move plays, with a per-move opt-out. Measured on the Zinogre (stamp_right_claw):
  • 113/113 moves played to the end;
  • the hit lands 1 AI frame after the spawn (15/15);
  • no damage after an attack's end (0/3, against 3/3 without one);
  • 0/4 host hits muted, against 4/4 with the opt-out;
  • the native AI picks its own next move (10/10);
  • a flinch ends the move one frame later (5/5);
  • soak of 50 and 10 moves in a row.
• Travel and turns (mhfu-port): the engine carries a monster's travel from joint 1, but ports kept it on joint 0, so they ran ahead and snapped back. travel.carry moves the donor's travel and body facing to where the engine takes them, for source-skeleton builds.
  • Optional [clips.x] turn (degrees). The build exports each entry's turn curve (_turns in <port>_clips.lua). The studio preview turns the model the same way.
  • mhfu-port travel [--against] reports what each clip travels and turns, and checks it against a measured game path.
• Steer (framework): turns YAW per frame (clip curve, toward or away from the hunter, fixed), and a wall ends the move. A class-2 wall hands the monster to the native stuck pair (0,6). Measured:
  • dash 1432 of 1439 units (0.995);
  • stamp turn 127.7° of 128°, no snap;
  • section-8 wall → (0,6) for 7.2 s → native AI.
• Ground: ports/zinogre.toml ground_lift = 0 (own commit 4ec1d3d; the stance waits for the owner's eye).
• Screenshots (ppsspp patch 0006, Client.save_screenshot, mhfu rig shot|film): the frame on screen to a PNG while the game runs, in a hidden lane too; 10/10, ~0.1 s each, filming at 10 fps costs no speed. Rig.open(state=…) no longer deadlocks on a fresh lane (50/50).
• mhfu observe path traces position, walls and clip per AI frame. mhfu now depends on Pillow (contact sheets).

Tests: 2192 passed, 46 skipped (GL, Blender, live), with both games' data; pre-commit clean. Live gates measured in lanes 1, 3, 4.

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