feat(packages): ludic.character - a third-person walking body: walk and run with their acceleration, a jump and gravity, a step within CHAR_STEP taken and a slope above it measured over a fixed probe, wading that shelves into a swim, the dive and the breath, sitting, one safe put-down spot, holds by reason, being carried, and the orbit camera with first-person eyes; ground, body and stick through ports; landed, jumped, footfall, too steep, the water's facts

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/ludic.character/system.ludic

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+# system.ludic - the body as a system: reset, a tick from the input port, and nothing saved (where a
+# body stands is the game's to write, with the rest of the player)
+export function char_reset() -> void {
+  char_teleport(0.0, 0.0, 0.0)
+  chr_time = 0.0
+  chr_phase = 0.0
+  chr_breath = CHAR_BREATH_MAX
+  chr_can_run = true
+  chr_sit_t = 0.0
+  chr_steep = 0.0
+  chr_land = 0.0
+  chr_edge_said = 0.0
+  chr_fps = false
+  q_clear(char_facts())
+}
+
+function chr_sys_tick(t: Tick) -> void { char_tick(t.dt) }
+
+export function char_system() -> System {
+  let s = system_new("character", PH_INPUT)
+  s.reset = fn char_reset
+  s.tick = fn chr_sys_tick
+  return s
+}