Avatars actually show; camera stops hugging the player

- SpringArm3D was colliding with the player's own capsule (same layer) ->
  camera yanked up against the head. add_excluded_object(self) in _ready +
  gentler default pitch, shorter arm, lower pivot.
- AvatarSystem.build_current_avatar() is now self-sufficient: loads the
  catalog itself and falls back to a bare default loadout if login didn't
  prime one. So the in-world player always shows an avatar, never the
  capsule, as long as the assets are packed (they are now).
- New AvatarSystem.assemble_avatar(): builds a standalone avatar with a
  throwaway loader, touching no shared state -- so it's safe to call once
  for the local player AND once per remote peer. (load_avatar()'s shared
  loader reset()s and freed the previous avatar on every call.)
- game.gd: remote players render as the assembled avatar too (shared default
  look, tinted per-peer, name tag) instead of a plain capsule.

Client-side -- rebuild the exe.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015jtxAiu5dAW4WxCNdGkrkJ

scripts/player.gd

@@ -25,7 +25,7 @@ const MOUSE_SENSITIVITY: float = 0.003
 # ---------------------------------------------------------------------------
 
 var _input_direction := Vector2.ZERO
-var _camera_pitch: float = -0.25
+var _camera_pitch: float = -0.12
 
 ## Vertical offset applied to the assembled avatar so its feet (origin y=0)
 ## line up with the bottom of the player's collision capsule.
@@ -70,6 +70,12 @@ func _ready() -> void:
 		push_warning("player.gd: no PlayerSpawn marker found; spawning at origin")
 		global_position = Vector3(0, 1.0, 0)
 
+	# The spring arm must not collide with the player's own capsule (they're
+	# on the same layer), or the camera gets yanked right up against the
+	# player's head.
+	var arm := $CameraPivot/SpringArm3D as SpringArm3D
+	arm.add_excluded_object(self)
+
 	# Start the camera arm tilted down a little so the avatar is framed.
 	_camera_pivot.rotation.x = _camera_pitch
 
@@ -81,18 +87,17 @@ func _ready() -> void:
 	_apply_avatar()
 
 
-## Replace the placeholder capsule with the player's assembled avatar, if the
-## AvatarSystem has a loadout primed (set at login by main_menu.gd). Falls back
-## to the capsule silently when there's no avatar to show -- e.g. running this
-## scene directly in a test, or an offline/failed catalog load.
-## TODO(PC3): a third-person camera so the local player actually sees this;
-## for now it's mainly for other players (Phase 2) and looking down.
+## Show the player's assembled avatar and hide the placeholder capsule.
+## AvatarSystem.build_current_avatar() is self-sufficient now (loads the
+## catalog + falls back to a default loadout), so this only no-ops if the
+## avatar assets themselves are missing.
 func _apply_avatar() -> void:
 	var avatars := get_node_or_null("/root/AvatarSystem")
 	if avatars == null or not avatars.has_method("build_current_avatar"):
 		return
 	var avatar: Node3D = avatars.build_current_avatar()
 	if avatar == null:
+		push_warning("player.gd: no avatar to show; keeping the placeholder capsule")
 		return
 	avatar.position = Vector3(0.0, AVATAR_FEET_OFFSET, 0.0)
 	add_child(avatar)