feat: initial implementation v0.1.0 — single player puppet + WASD + map

Composer module: single-player character as puppet (humanoid 4-bone
rig: torso, head, leg_l, leg_r) at world (320, 240) on a 20x20
v0.1-format tilemap.

- WASD direct movement, normalized for diagonals, 120 px/s.
- Camera-chase via lib-core.camera target-provider (camera follows
  puppet position frame-to-frame).
- Idle and walk keyframe animations: idle is a 2s torso-sway on the
  upper track; walk is a 0.6s leg-cycle on the lower track.
- Animation-state transitions driven by movement input: walk while
  WASD-active, idle when released.
- Headtrack: head bone (marked look_at: true in rig) rotates each
  frame to face the mouse cursor's world position via
  puppet.set_look_target.
- ESC -> launcher.

CI hooks (env-var-gated, no-op in normal play):
- SPOREL_CI=1: emits 'vagrant: frame_avg_ms=N' after 60 frames and
  'vagrant: render_frame_ok' per frame from the render hook, then
  engine.exit(0). Smoke stages consume these markers.

manifest.module

@@ -0,0 +1,15 @@
+{
+    "id": "vagrant-skeleton",
+    "version": "0.1.0",
+    "kind": "module",
+    "api": "^0.1",
+    "ci_frames": 60,
+    "entry_point": "init.lua",
+    "deps": [
+        {"id": "lib-core.input",  "version": "0.4.0"},
+        {"id": "lib-core.camera", "version": "0.3.0"},
+        {"id": "lib-core.render", "version": "0.1.0"},
+        {"id": "lib-core.maps",   "version": "0.1.1"},
+        {"id": "lib-core.puppet", "version": "0.1.0"}
+    ]
+}