nx_gx4_walk_gate.nx

nx_gx4_walk_gate.nx -- Gx-4 FIRST PLAYABLE: an INPUT-DRIVEN player walks through a 3D heightfield world, rendered per-tick through the first-class <canvas> substrate (Gx-1c) in the LIVE Nishi-Browser. The loop is the real game shape: input event -> player state (position + heading) -> build the player-relative world mesh -> the REAL nx_swgpu pipeline (3 altitude-band albedo passes over ONE shared zbuf via the new sg_render_pass) -> blit into the page's canvas box -> full browser repaint. FLOOR LAW: lit, color-banded 3D terrain with sky + depth (no terminal rects). DETERMINISM: the same input script replayed gives byte-identical frames (the sovereign exceed). Honest: keyboard events are SIMULATED as a script (no interactive event loop in a gate); terrain is double-sided (no backface ambiguity while winding conventions settle). World geometry now comes from the shared nx_game_world lib; near-plane clipping and the tonemap are live (seq249/seq260). license_tier: ORIGINAL expect_exit: 0