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/scenes/main.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=17 format=3 uid="uid://bswrmh7w8dbgm"]
+[gd_scene load_steps=19 format=3 uid="uid://bswrmh7w8dbgm"]
 
 [ext_resource type="Script" path="res://scripts/main.gd" id="1_main"]
 [ext_resource type="Script" path="res://scripts/rendering/world_renderer.gd" id="2_world"]
@@ -16,6 +16,8 @@
 [ext_resource type="PackedScene" path="res://ui/world_radial.tscn" id="14_radial"]
 [ext_resource type="PackedScene" path="res://ui/dialogue_box.tscn" id="15_dialogue"]
 [ext_resource type="Script" path="res://scripts/rendering/fog_entities.gd" id="16_fogent"]
+[ext_resource type="PackedScene" path="res://ui/gauntlet_hud.tscn" id="17_gauntlet"]
+[ext_resource type="PackedScene" path="res://ui/bug_report_dialog.tscn" id="18_bugreport"]
 
 [node name="Game" type="Node2D"]
 script = ExtResource("1_main")
@@ -131,6 +133,9 @@ layer = 20
 ; D-053: Stance indicator — top-right, color-coded
 [node name="StanceIndicator" parent="UILayer" instance=ExtResource("13_stance")]
 
+; #496: Gauntlet HUD — room timer + personal bests, hidden in non-gauntlet mode
+[node name="GauntletHUD" parent="UILayer" instance=ExtResource("17_gauntlet")]
+
 ; D-065: Inventory grid — 3x3, bottom-right, 40x40px, 1-9 hotkeys
 [node name="InventoryGrid" parent="UILayer" instance=ExtResource("12_inv")]
 
@@ -140,6 +145,8 @@ script = ExtResource("10_cursor")
 
 ; --- Modal layer (CanvasLayer 30) ---
 ; Full-screen overlays: pause menu, inventory modal, death screen.
-; Empty for Sprint 6 — exists so the layer is reserved in the tree.
 [node name="ModalLayer" type="CanvasLayer" parent="."]
 layer = 30
+
+; #495: WRONG button (F12) — bug report capture dialog
+[node name="BugReportDialog" parent="ModalLayer" instance=ExtResource("18_bugreport")]

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()

client/ui/gauntlet_hud.gd

@@ -0,0 +1,180 @@
+extends Control
+
+## #496: Gauntlet HUD — room timer + personal bests.
+## Shows TIMER: MM:SS (PB: MM:SS) in top-right, below StanceIndicator.
+## Hidden in non-gauntlet mode. Stats persisted to tests/gauntlet-stats.json.
+
+const BG_COLOR := Color(0.05, 0.05, 0.08, 0.5)
+const TIMER_COLOR := Color("#c8d0e0")       # Default insert text
+const PB_COLOR := Color("#6bc9a6")          # Friendly green — personal best
+const NEW_PB_COLOR := Color("#e8c547")      # Amber flash on new PB
+const FONT_SIZE := 13
+const PADDING := Vector2(10, 6)
+const STATS_PATH := "user://gauntlet-stats.json"
+
+var _timer_seconds: float = 0.0
+var _timer_running: bool = false
+var _current_room_id: Variant = null
+var _personal_bests: Dictionary = {}  # room_id -> float (seconds)
+var _session_rooms: Dictionary = {}  # room_id -> {attempts: int, best: float}
+var _new_pb_flash: float = 0.0  # Countdown for PB flash effect
+
+
+func _ready() -> void:
+	mouse_filter = Control.MOUSE_FILTER_IGNORE
+	visible = false
+	_load_stats()
+
+
+func _process(delta: float) -> void:
+	if not visible:
+		return
+	if _timer_running:
+		_timer_seconds += delta
+		queue_redraw()
+	if _new_pb_flash > 0.0:
+		_new_pb_flash -= delta
+		queue_redraw()
+
+
+func update_from_state() -> void:
+	if not GameState.gauntlet_mode:
+		if visible:
+			visible = false
+		return
+
+	if not visible:
+		visible = true
+		queue_redraw()
+
+	var new_room_id: Variant = GameState.room_id
+	if new_room_id == null:
+		# Gauntlet mode but no room yet — stop timer, wait
+		_timer_running = false
+		return
+
+	if new_room_id != _current_room_id:
+		_on_room_change(new_room_id)
+
+
+func _on_room_change(new_room_id: String) -> void:
+	# Record completion of previous room
+	if _current_room_id != null and _timer_running:
+		_record_room_completion(_current_room_id, _timer_seconds)
+
+	# Start timer for new room
+	_current_room_id = new_room_id
+	_timer_seconds = 0.0
+	_timer_running = true
+
+	# Track session stats
+	if not _session_rooms.has(new_room_id):
+		_session_rooms[new_room_id] = {"attempts": 0, "best": INF}
+	_session_rooms[new_room_id]["attempts"] += 1
+
+	queue_redraw()
+
+
+func _record_room_completion(completed_room_id: String, seconds: float) -> void:
+	var old_pb: float = _personal_bests.get(completed_room_id, INF)
+	if seconds < old_pb:
+		_personal_bests[completed_room_id] = seconds
+		_new_pb_flash = 2.0  # Flash for 2 seconds
+		_save_stats()
+
+	# Update session tracking
+	if _session_rooms.has(completed_room_id):
+		var entry: Dictionary = _session_rooms[completed_room_id]
+		if seconds < entry["best"]:
+			entry["best"] = seconds
+
+
+func _draw() -> void:
+	var font := ThemeDB.fallback_font
+
+	var timer_text := "TIMER: " + _format_time(_timer_seconds)
+	var pb_text := ""
+	if _current_room_id != null and _personal_bests.has(_current_room_id):
+		pb_text = " (PB: " + _format_time(_personal_bests[_current_room_id]) + ")"
+
+	var full_text := timer_text + pb_text
+	var text_size := font.get_string_size(full_text, HORIZONTAL_ALIGNMENT_LEFT, -1, FONT_SIZE)
+	var box_size := text_size + PADDING * 2
+
+	# Background
+	draw_rect(Rect2(Vector2.ZERO, box_size), BG_COLOR)
+
+	# Timer text
+	var y_offset := PADDING.y + text_size.y
+	var timer_size := font.get_string_size(timer_text, HORIZONTAL_ALIGNMENT_LEFT, -1, FONT_SIZE)
+	draw_string(font, Vector2(PADDING.x, y_offset), timer_text, HORIZONTAL_ALIGNMENT_LEFT, -1, FONT_SIZE, TIMER_COLOR)
+
+	# PB text (different color)
+	if not pb_text.is_empty():
+		var pb_color: Color = NEW_PB_COLOR if _new_pb_flash > 0.0 else PB_COLOR
+		draw_string(font, Vector2(PADDING.x + timer_size.x, y_offset), pb_text, HORIZONTAL_ALIGNMENT_LEFT, -1, FONT_SIZE, pb_color)
+
+
+static func _format_time(seconds: float) -> String:
+	var total_secs := int(seconds)
+	var mins := total_secs / 60
+	var secs := total_secs % 60
+	return "%02d:%02d" % [mins, secs]
+
+
+func _load_stats() -> void:
+	if not FileAccess.file_exists(STATS_PATH):
+		return
+	var file := FileAccess.open(STATS_PATH, FileAccess.READ)
+	if file == null:
+		return
+	var json := JSON.new()
+	var err := json.parse(file.get_as_text())
+	file.close()
+	if err == OK and json.data is Dictionary:
+		_personal_bests = json.data
+
+
+func _save_stats() -> void:
+	var file := FileAccess.open(STATS_PATH, FileAccess.WRITE)
+	if file == null:
+		push_warning("GauntletHUD: cannot write stats to %s" % STATS_PATH)
+		return
+	file.store_string(JSON.stringify(_personal_bests, "\t"))
+	file.close()
+
+
+func print_session_summary() -> void:
+	if _session_rooms.is_empty():
+		return
+	print("=== Gauntlet Session Summary ===")
+	for room_id in _session_rooms:
+		var entry: Dictionary = _session_rooms[room_id]
+		var best_str := _format_time(entry["best"]) if entry["best"] != INF else "--:--"
+		var pb_str := _format_time(_personal_bests[room_id]) if _personal_bests.has(room_id) else "--:--"
+		print("  Room %s: %d attempts, session best %s, all-time PB %s" % [
+			room_id, entry["attempts"], best_str, pb_str])
+	print("================================")
+
+
+# Record current room if timer is running (called on disconnect)
+func finalize() -> void:
+	if _current_room_id != null and _timer_running:
+		_record_room_completion(_current_room_id, _timer_seconds)
+		_timer_running = false
+	print_session_summary()
+
+
+# -- Public API ---------------------------------------------------------------
+
+func get_timer_seconds() -> float:
+	return _timer_seconds
+
+func is_timer_running() -> bool:
+	return _timer_running
+
+func get_current_room_id() -> Variant:
+	return _current_room_id
+
+func get_personal_best(for_room_id: String) -> float:
+	return _personal_bests.get(for_room_id, INF)

client/ui/gauntlet_hud.tscn

@@ -0,0 +1,17 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://ui/gauntlet_hud.gd" id="1_gauntlet"]
+
+; #496: Gauntlet HUD — room timer + personal bests, top-right below StanceIndicator
+[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_right = -16.0
+offset_bottom = 74.0
+grow_horizontal = 0
+mouse_filter = 2
+script = ExtResource("1_gauntlet")