fix(ui): resolve HUD layout overlaps (#792)

- DebugOverlay: position comment updated, tscn is source of truth
- GauntletHUD: moved from y:48 to y:252 (below StanceIndicator)
- StanceIndicator: offset_top 192→200, height 26→44px for ImplantPanel

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

client/ui/debug_overlay.gd

@@ -76,7 +76,7 @@ var _tick_deltas: Array = []  # ms between consecutive snapshots
 func _ready() -> void:
 	_dev_mode = OS.is_debug_build()
 	visible = false
-	position.y = 150.0  # Below TimeDisplay (16-70) + HUD status panel (80-140)
+	# Position set in main.tscn: below merged HUD status panel (starts at y:16)
 	_cached_font = ThemeDB.fallback_font
 	# Clear NPC path history on session change to prevent entity ID collisions
 	GameState.connect("game_id_changed", _on_game_id_changed)

client/ui/gauntlet_hud.tscn

@@ -2,16 +2,16 @@
 
 [ext_resource type="Script" path="res://ui/gauntlet_hud.gd" id="1_gauntlet"]
 
-; #496: Gauntlet HUD — room timer + personal bests, top-right below StanceIndicator
+; #496: Gauntlet HUD — room timer + personal bests, top-right below StanceIndicator (bottom at y:244)
 [node name="GauntletHUD" type="Control"]
 layout_mode = 3
 anchors_preset = 1
 anchor_left = 1.0
 anchor_right = 1.0
 offset_left = -160.0
-offset_top = 48.0
+offset_top = 252.0
 offset_right = -16.0
-offset_bottom = 74.0
+offset_bottom = 278.0
 grow_horizontal = 0
 mouse_filter = 2
 script = ExtResource("1_gauntlet")

client/ui/stance_indicator.tscn

@@ -2,16 +2,17 @@
 
 [ext_resource type="Script" path="res://ui/stance_indicator.gd" id="1_stance"]
 
-; D-053: Stance indicator — below minimap, right-aligned
+; D-053: Stance indicator — below minimap (bottom at y:176), 24px gap.
+; Control height 44px to contain ImplantPanel (padding 12+12 + row 18 = 42px minimum).
 [node name="StanceIndicator" type="Control"]
 layout_mode = 3
 anchors_preset = 1
 anchor_left = 1.0
 anchor_right = 1.0
 offset_left = -100.0
-offset_top = 192.0
+offset_top = 200.0
 offset_right = -16.0
-offset_bottom = 218.0
+offset_bottom = 244.0
 grow_horizontal = 0
 mouse_filter = 2
 script = ExtResource("1_stance")