fix(ui): address PR #115 review — 8 items

- Fix stale test path UILayer/HUD → InsertOverlay/HUD
- Fix D-record citation D-051 → D-049 in main.tscn
- Add null guards to hud.gd update methods (pre-_ready safety)
- Minimap: dirty-flag queue_redraw instead of per-frame
- Remove redundant _panel.size.x, debug print
- Fix DebugOverlay/GauntletHUD positioning comments

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

client/ui/minimap.gd

@@ -38,6 +38,11 @@ var _insert_active: bool = true
 # D-169: StyleBoxFlat matching ImplantPanel aesthetic — drawn as container frame behind the circle.
 var _container_style: StyleBoxFlat = null
 
+# Dirty flag — only queue_redraw() when player position or POI list changes.
+var _dirty: bool = true
+var _last_player_pos: Vector2 = Vector2(INF, INF)
+var _last_poi_count: int = -1
+
 
 func _ready() -> void:
 	mouse_filter = Control.MOUSE_FILTER_IGNORE
@@ -57,7 +62,16 @@ func _init_container_style() -> void:
 
 
 func _process(_delta: float) -> void:
-	if _insert_active:
+	if not _insert_active:
+		return
+	var pos := GameState.player_position
+	var poi_count := GameState.discovered_pois.size()
+	if pos != _last_player_pos or poi_count != _last_poi_count:
+		_last_player_pos = pos
+		_last_poi_count = poi_count
+		_dirty = true
+	if _dirty:
+		_dirty = false
 		queue_redraw()
 
 
@@ -66,6 +80,8 @@ func _process(_delta: float) -> void:
 func set_insert_active(active: bool) -> void:
 	_insert_active = active
 	visible = active
+	if active:
+		_dirty = true
 
 
 func _draw() -> void: