fix(vagrant): iteration — body+head look-at, WASD-driven leg-facing, idle-collapse

- humanoid.rig.json: root removed from upper track; body look_at + slow speed
  (180 deg/s, lazy); head fast speed (480 deg/s) + +-90 deg limits; puppet
  dep bumped to 0.3.1
- animations/idle_lower.anim.json (NEW): leg+foot scl=[mirror, 0] keeps legs
  invisible at idle (locomotion skips animated bones; foot cascade zeros out)
- init.lua: set_procedural 'facing' callback writes root.rot from
  last_walk_rot_deg each frame; WASD-vector updates last_walk_rot_deg
  via atan(dx, -dy); idle_lower played parallel to idle, stopped during walk

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

animations/idle_lower.anim.json

@@ -0,0 +1,13 @@
+{
+  "id": "idle_lower",
+  "track": "lower",
+  "duration": 1.0,
+  "loop": true,
+  "keyframes": [
+    { "t": 0.0,
+      "leg_l":  {"scl": [-1, 0]},  "leg_r":  {"scl": [ 1, 0]},
+      "foot_l": {"scl": [ 1, 0], "pos": [0, 0]},
+      "foot_r": {"scl": [ 1, 0], "pos": [0, 0]}
+    }
+  ]
+}

init.lua

@@ -1,4 +1,4 @@
--- sporel-module-vagrant-skeleton v0.2.0
+-- sporel-module-vagrant-skeleton v0.3.1
 -- Sprite-mode test-chamber: 13-bone humanoid puppet + sprite-tilemap +
 -- hardcoded furniture. F.vagrant Tier-1 + Sprite-Upgrade-Bridge state.
 
@@ -17,6 +17,7 @@ local state = {
     bed_tex = nil,
     bench_tex = nil,
     backpack_tex = nil,
+    last_walk_rot_deg = 0,  -- persisted root.rot (degrees) across idle frames
 }
 
 -- CI hook gating (mirrors Phase 1 convention).
@@ -34,6 +35,7 @@ local function set_walk_or_idle(moving)
     if moving then
         if not puppet.is_playing(state.player, "walk") then
             puppet.stop(state.player, "idle")
+            puppet.stop(state.player, "idle_lower")
             puppet.play(state.player, "walk",       { loop = true })
             puppet.play(state.player, "walk_upper", { loop = true })
         end
@@ -42,6 +44,7 @@ local function set_walk_or_idle(moving)
             puppet.stop(state.player, "walk")
             puppet.stop(state.player, "walk_upper")
             puppet.play(state.player, "idle",       { loop = true })
+            puppet.play(state.player, "idle_lower", { loop = true })
         end
     end
     if CI_FRAME_PERF and new_state ~= ci_last_state then
@@ -64,10 +67,20 @@ function M.init(ctx)
     local walk = puppet.load_animation("animations/walk.anim.json", rig)
     local walk_upper = puppet.load_animation("animations/walk_upper.anim.json", rig)
     local idle = puppet.load_animation("animations/idle.anim.json", rig)
+    local idle_lower = puppet.load_animation("animations/idle_lower.anim.json", rig)
     puppet.register_animation(state.player, idle)
     puppet.register_animation(state.player, walk)
     puppet.register_animation(state.player, walk_upper)
+    puppet.register_animation(state.player, idle_lower)
     puppet.play(state.player, "idle",       { loop = true })
+    puppet.play(state.player, "idle_lower", { loop = true })
+
+    -- Procedural facing: root.rot = state.last_walk_rot_deg every frame.
+    -- Fires inside update_bone_recursive at root-visit (after reset, before compute_world).
+    -- Root is not in any track, so write_bone bypasses track-guard.
+    puppet.set_procedural(state.player, "facing", function(handle, dt)
+        puppet.write_bone(handle, "root", { rot = state.last_walk_rot_deg })
+    end)
 
     -- Furniture textures (preload to avoid first-frame load stutter).
     local world_lib = aliases.world
@@ -113,6 +126,7 @@ function M.update(ctx, dt)
         if ci_drive_frame > 20 and ci_drive_frame <= 40 then
             dx = 1; dy = 0
             moving = true
+            state.last_walk_rot_deg = math.deg(math.atan(dx, -dy))  -- atan(1, 0) = pi/2 = 90deg
             local pos = puppet.position(state.player)
             puppet.move_to(state.player,
                 pos.x + dx * state.player_speed * dt, pos.y)
@@ -123,6 +137,8 @@ function M.update(ctx, dt)
 
     if moving and not CI_DRIVE then
         local len = math.sqrt(dx * dx + dy * dy)
+        -- Update last_walk_rot_deg (sprite-top convention: angle=atan(dx,-dy)).
+        state.last_walk_rot_deg = math.deg(math.atan(dx / len, -dy / len))
         local pos = puppet.position(state.player)
         puppet.move_to(state.player,
             pos.x + dx / len * state.player_speed * dt,

manifest.module

@@ -15,7 +15,7 @@
         {"id": "lib-core.camera",                 "version": "0.3.0"},
         {"id": "lib-core.render",                 "version": "0.1.0"},
         {"id": "lib-core.maps",                   "version": "0.1.2"},
-        {"id": "lib-core.puppet",                 "version": "0.3.0"},
+        {"id": "lib-core.puppet",                 "version": "0.3.1"},
         {"id": "lib-asset.prototype-subterrain",  "version": "0.1.1"}
     ]
 }

rigs/humanoid.rig.json

@@ -3,8 +3,8 @@
   "asset_pack": "player",
   "bones": [
     { "id": "root",        "parent": null,         "rest": {"x":   0, "y":   0, "rot": 0},                   "z_order": -1 },
-    { "id": "body",        "parent": "root",       "rest": {"x":   0, "y":   0, "rot": 0},                   "z_order":  2, "texture": "body_001" },
+    { "id": "body",        "parent": "root",       "rest": {"x":   0, "y":   0, "rot": 0},                   "z_order":  2, "texture": "body_001", "look_at": true, "look_at_speed": 180 },
-    { "id": "head",        "parent": "body",       "rest": {"x":   0, "y":  -3, "rot": 0},                   "z_order":  6, "texture": "head_001", "look_at": true },
+    { "id": "head",        "parent": "body",       "rest": {"x":   0, "y":  -3, "rot": 0, "rot_min": -90, "rot_max": 90}, "z_order":  6, "texture": "head_001", "look_at": true, "look_at_speed": 480 },
     { "id": "shoulders",   "parent": "body",       "rest": {"x":   0, "y":   0, "rot": 0},                   "z_order":  5, "texture": "shoulder_001" },
     { "id": "upper_arm_l", "parent": "shoulders",  "rest": {"x": -19, "y":  -3, "rot": 0, "scl": [-1,  1]}, "z_order":  3, "texture": "upper_arm_001" },
     { "id": "upper_arm_r", "parent": "shoulders",  "rest": {"x":  20, "y":  -4, "rot": 0},                   "z_order":  3, "texture": "upper_arm_001" },
@@ -17,7 +17,7 @@
   ],
   "tracks": [
     { "id": "lower", "bones": ["leg_l", "leg_r", "foot_l", "foot_r"] },
-    { "id": "upper", "bones": ["root", "body", "head", "shoulders", "upper_arm_l", "upper_arm_r", "lower_arm_l", "lower_arm_r"] }
+    { "id": "upper", "bones": ["body", "head", "shoulders", "upper_arm_l", "upper_arm_r", "lower_arm_l", "lower_arm_r"] }
   ],
   "locomotion": {
     "mode": "procedural",