feat(client): add gauntlet room timer + personal bests (#496)

GauntletHUD in UILayer shows TIMER: MM:SS (PB: MM:SS). Timer starts on
room entry, resets on room change, records personal bests to
user://gauntlet-stats.json. Session summary printed on disconnect.
Hidden in non-gauntlet mode (anti-tedium guard).

Adds room_id and gauntlet_mode fields to GameState, parsed from
ObserverSnapshot. Main.gd wires update_from_state() and finalize().

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

client/scripts/autoloads/game_state.gd

@@ -36,6 +36,10 @@ var current_dialogue: Variant = null  # {npc_name, npc_entity_id, speech, option
 # InputMapper suppresses movement when this is true.
 var dialogue_active: bool = false
 
+# v8 fields (#496): Gauntlet mode — room timer + personal bests
+var room_id: Variant = null  # String room_id from snapshot, null in non-gauntlet mode
+var gauntlet_mode: bool = false  # true when snapshot includes gauntlet_mode flag
+
 # v7 fields (#431, D-059/D-060)
 var pending_recognitions: Array = []  # [{entity_id, x, y, z, remaining_ticks, total_delay_ticks}]
 
@@ -118,6 +122,16 @@ func apply_snapshot(snapshot: Dictionary) -> void:
 	else:
 		pending_recognitions = []
 
+	# v8: gauntlet mode (#496) — room_id and gauntlet_mode
+	if snapshot.has("gauntlet_mode") and snapshot.gauntlet_mode == true:
+		gauntlet_mode = true
+	else:
+		gauntlet_mode = false
+	if snapshot.has("room_id") and snapshot.room_id is String:
+		room_id = snapshot.room_id
+	else:
+		room_id = null
+
 	# v2: visible_tiles with visibility sectors
 	# Derives visible_positions when not explicitly provided (real server mode)
 	if snapshot.has("visible_tiles") and snapshot.visible_tiles is Array and snapshot.visible_tiles.size() > 0:

client/scripts/main.gd

@@ -12,6 +12,8 @@ extends Node2D
 @onready var inventory_grid = $UILayer/InventoryGrid  # D-065: z-layer 7
 @onready var stance_indicator = $UILayer/StanceIndicator  # D-053: z-layer 7
 @onready var cursor_renderer = $UILayer/CursorRenderer  # D-056: z-layer 7
+@onready var gauntlet_hud = $UILayer/GauntletHUD  # #496: room timer + personal bests
+@onready var bug_report_dialog = $ModalLayer/BugReportDialog  # #495: F12 WRONG button
 
 var _last_dialogue_npc_id: int = -1  # D-064: NPC entity_id for WalkAway input
 var _camera_anchored: bool = false
@@ -49,6 +51,10 @@ func _ready() -> void:
 		dialogue_box.dialogue_dismissed.connect(_on_dialogue_dismissed)
 		dialogue_box.confrontation_monologue.connect(_on_confrontation_monologue)
 
+	# #496: Print gauntlet session summary on disconnect
+	if gauntlet_hud:
+		SimBridge.connection_state_changed.connect(_on_connection_state_changed)
+
 
 func _process(_delta: float) -> void:
 	# Main game loop: poll snapshot, apply state, flush input
@@ -88,6 +94,10 @@ func _process(_delta: float) -> void:
 		if fog_entities and fog_entities.has_method("update_from_state"):
 			fog_entities.update_from_state()
 
+		# #496: Update gauntlet HUD (room timer + personal bests)
+		if gauntlet_hud and gauntlet_hud.has_method("update_from_state"):
+			gauntlet_hud.update_from_state()
+
 		# Show monologue if server sent one this tick (#414)
 		_consume_monologue()
 
@@ -109,6 +119,11 @@ func _process(_delta: float) -> void:
 	# Send queued input to simulation
 	var inputs = InputMapper.flush_queue()
 	for input in inputs:
+		# #495: F12 WRONG button — client-only, trigger bug report capture
+		if input.action == InputMapper.Action.BUG_REPORT:
+			if bug_report_dialog and not bug_report_dialog.is_active():
+				bug_report_dialog.start_capture()
+			continue
 		if input.action == InputMapper.Action.INTERACT:
 			# D-057: prefer interaction list (multi-verb), fall back to prompt (v0.1)
 			var target_id: int = -1
@@ -197,3 +212,9 @@ func _on_dialogue_dismissed() -> void:
 			"verb": "WalkAway",
 		},
 	})
+
+
+# #496: Finalize gauntlet stats on disconnect
+func _on_connection_state_changed(old_state: SimBridge.ConnectionState, new_state: SimBridge.ConnectionState) -> void:
+	if new_state == SimBridge.ConnectionState.DISCONNECTED and gauntlet_hud:
+		gauntlet_hud.finalize()