feat(vagrant): sprint (shift+wasd) + backpack interaction

Sprint: holding shift while WASD doubles player_speed (120 → 240) and
walk-anim play-speed (0.45 → 0.9). Mid-walk sprint toggle uses puppet
v0.4.4 set_play_speed → no cycle restart. Releasing shift or stopping
WASD reverts to normal speed in next frame.

Interaction: 'interact' bound to E. Proximity trigger registered on
the backpack sprite at (350, 400) with range 40px. Pressing E within
range fires callback that prints a log message with the actor distance.
Uses existing lib-core.interaction (registered at init, polled by
interaction.update(player.x, player.y) each frame).

New dep: lib-core.interaction ^0.1.0. Module version 0.4.0 → 0.4.4
(syncs with puppet bump).

manifest.module

@@ -1,6 +1,6 @@
 {
     "id": "vagrant-skeleton",
-    "version": "0.4.0",
+    "version": "0.4.4",
     "kind": "module",
     "api": "^0.1",
     "ci_frames": 60,
@@ -15,7 +15,8 @@
         {"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": "0.4.3"},
+        {"id": "lib-core.puppet",                 "version": "0.4.4"},
+        {"id": "lib-core.interaction",            "version": "0.1.0"},
         {"id": "lib-asset.prototype-subterrain",  "version": "0.1.1"}
     ]
 }