feat(client): add WRONG button F12 bug report capture (#495)

F12 pauses simulation, shows modal LineEdit prompt, saves three files
to user://bug-reports/gauntlet-t{tick}-{timestamp}/: snapshot.json
(full ObserverSnapshot), render.txt (simplified client-side text
render), description.txt (tester notes + tick/room/stance metadata).
Esc cancels without saving. Double-activation guard prevents stacking.

BUG_REPORT action added to InputMapper with wire guard in SimBridge
(client-only, never sent to server). Dialog on ModalLayer (CL 30).

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

client/project.godot

@@ -106,6 +106,11 @@ stance_down={
 "events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":88,"key_label":0,"unicode":120,"location":0,"echo":false,"script":null)
 ]
 }
+bug_report={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194343,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
 
 [rendering]
 

client/scripts/autoloads/input_mapper.gd

@@ -14,6 +14,7 @@ enum Action {
 	MOVE_SOUTH, MOVE_SOUTHWEST, MOVE_WEST, MOVE_NORTHWEST,
 	INTERACT, USE_PERCEPTION_MODE, OPEN_MENU, PAUSE, UNPAUSE,
 	TOGGLE_STANCE_UP, TOGGLE_STANCE_DOWN,
+	BUG_REPORT,  # #495: F12 WRONG button — client-only, not sent to server
 }
 
 var input_queue: Array[Dictionary] = []
@@ -74,6 +75,8 @@ func _unhandled_input(event: InputEvent) -> void:
 		action = Action.TOGGLE_STANCE_UP
 	elif event.is_action_pressed("stance_down"):
 		action = Action.TOGGLE_STANCE_DOWN
+	elif event.is_action_pressed("bug_report"):
+		action = Action.BUG_REPORT
 
 	if action != -1:
 		input_queue.append({

client/scripts/autoloads/sim_bridge.gd

@@ -258,6 +258,10 @@ static func _action_enum_to_wire(action: int) -> String:
 			# Client-only action, not part of wire protocol
 			push_warning("SimBridge: OPEN_MENU is client-only, not sent to server")
 			return ""
+		InputMapper.Action.BUG_REPORT:
+			# Client-only action (#495), not part of wire protocol
+			push_warning("SimBridge: BUG_REPORT is client-only, not sent to server")
+			return ""
 		_:
 			push_warning("SimBridge: unknown action enum %s" % action)
 			return ""

client/ui/bug_report_dialog.gd

@@ -0,0 +1,192 @@
+extends Control
+
+## #495: WRONG button (F12) MVP — bug report capture dialog.
+## On F12: pause sim, show one-line prompt, save snapshot + render + description, unpause.
+## Output: user://bug-reports/gauntlet-t{tick}-{timestamp}/
+
+signal capture_completed
+signal capture_cancelled
+
+const BG_COLOR := Color(0.05, 0.05, 0.08, 0.85)
+const BORDER_COLOR := Color("#4a9ebb")
+const TEXT_COLOR := Color("#c8d0e0")
+const FONT_SIZE := 14
+const LABEL_FONT_SIZE := 13
+const BOX_WIDTH := 500
+const BOX_HEIGHT := 120
+const PADDING := 16
+
+var _line_edit: LineEdit = null
+var _active: bool = false
+
+
+func _ready() -> void:
+	visible = false
+	mouse_filter = Control.MOUSE_FILTER_STOP
+
+
+func start_capture() -> void:
+	if _active:
+		return
+	_active = true
+	visible = true
+
+	# Pause the simulation
+	SimBridge.send_input({
+		"action": InputMapper.Action.PAUSE,
+		"timestamp_msec": Time.get_ticks_msec(),
+	})
+
+	# Create the LineEdit dynamically
+	_line_edit = LineEdit.new()
+	_line_edit.placeholder_text = "Describe the issue..."
+	_line_edit.size = Vector2(BOX_WIDTH - PADDING * 2, 30)
+	_line_edit.position = Vector2(
+		(get_viewport_rect().size.x - BOX_WIDTH) / 2.0 + PADDING,
+		(get_viewport_rect().size.y - BOX_HEIGHT) / 2.0 + 50
+	)
+	_line_edit.add_theme_font_size_override("font_size", FONT_SIZE)
+	_line_edit.text_submitted.connect(_on_text_submitted)
+	add_child(_line_edit)
+	_line_edit.grab_focus()
+
+
+func _on_text_submitted(text: String) -> void:
+	_save_report(text)
+	_close()
+	capture_completed.emit()
+
+
+func _unhandled_input(event: InputEvent) -> void:
+	if not _active:
+		return
+	if event is InputEventKey and event.pressed and event.keycode == KEY_ESCAPE:
+		_close()
+		capture_cancelled.emit()
+		get_viewport().set_input_as_handled()
+
+
+func _close() -> void:
+	_active = false
+	visible = false
+	if _line_edit:
+		_line_edit.queue_free()
+		_line_edit = null
+
+	# Unpause the simulation
+	SimBridge.send_input({
+		"action": InputMapper.Action.UNPAUSE,
+		"timestamp_msec": Time.get_ticks_msec(),
+	})
+
+
+func _save_report(description: String) -> void:
+	var tick := GameState.current_tick
+	var timestamp := Time.get_datetime_string_from_system().replace(":", "-").replace("T", "_")
+	var dir_name := "gauntlet-t%d-%s" % [tick, timestamp]
+	var base_path := "user://bug-reports/" + dir_name
+
+	# Ensure directory exists
+	DirAccess.make_dir_recursive_absolute(base_path)
+
+	# 1. snapshot.json — full current snapshot as JSON
+	var snapshot_path := base_path + "/snapshot.json"
+	var snapshot_file := FileAccess.open(snapshot_path, FileAccess.WRITE)
+	if snapshot_file:
+		snapshot_file.store_string(JSON.stringify(GameState.current_snapshot, "\t"))
+		snapshot_file.close()
+
+	# 2. render.txt — simplified client-side text render of snapshot
+	var render_path := base_path + "/render.txt"
+	var render_file := FileAccess.open(render_path, FileAccess.WRITE)
+	if render_file:
+		render_file.store_string(_render_snapshot_text())
+		render_file.close()
+
+	# 3. description.txt — tester description + metadata
+	var desc_path := base_path + "/description.txt"
+	var desc_file := FileAccess.open(desc_path, FileAccess.WRITE)
+	if desc_file:
+		desc_file.store_string("Description: %s\n" % description)
+		desc_file.store_string("Tick: %d\n" % tick)
+		desc_file.store_string("Room: %s\n" % str(GameState.room_id if GameState.room_id else "none"))
+		desc_file.store_string("Stance: %s\n" % GameState.player_stance)
+		desc_file.store_string("Facing: %s\n" % GameState.player_facing)
+		desc_file.store_string("Position: %s\n" % str(GameState.player_position))
+		desc_file.store_string("Timestamp: %s\n" % Time.get_datetime_string_from_system())
+		desc_file.close()
+
+	print("BugReport: saved to %s" % base_path)
+
+
+## Simplified client-side text render of the current snapshot.
+## MVP version — full fidelity via server's format_snapshot_text() is a stretch goal.
+func _render_snapshot_text() -> String:
+	var lines: PackedStringArray = []
+	lines.append("=== Snapshot t%d ===" % GameState.current_tick)
+	lines.append("Player: %s facing %s (%s)" % [
+		str(GameState.player_position), GameState.player_facing, GameState.player_stance])
+
+	if GameState.game_time.size() > 0:
+		lines.append("Time: day %s, %s, %s" % [
+			str(GameState.game_time.get("day", "?")),
+			str(GameState.game_time.get("day_phase", "?")),
+			str(GameState.game_time.get("tick_rate", "?"))])
+
+	lines.append("")
+	lines.append("Entities (%d):" % GameState.visible_entities.size())
+	for entity in GameState.visible_entities:
+		var kind_str: String = ""
+		if entity.has("kind") and entity.kind is Dictionary:
+			kind_str = entity.kind.get("variant", "?")
+		elif entity.has("kind") and entity.kind is String:
+			kind_str = entity.kind
+		var vis: String = entity.get("visibility", "?")
+		lines.append("  #%s %s at (%s, %s) [%s]" % [
+			str(entity.get("entity_id", "?")),
+			kind_str,
+			str(entity.get("x", "?")),
+			str(entity.get("y", "?")),
+			vis])
+
+	lines.append("")
+	lines.append("Visible tiles: %d" % GameState.visible_tiles.size())
+
+	if GameState.current_monologue != null:
+		lines.append("Monologue: %s" % str(GameState.current_monologue.get("text", "")))
+	if GameState.current_dialogue != null:
+		lines.append("Dialogue: %s says '%s'" % [
+			str(GameState.current_dialogue.get("npc_name", "?")),
+			str(GameState.current_dialogue.get("speech", ""))])
+
+	return "\n".join(lines)
+
+
+func _draw() -> void:
+	if not _active:
+		return
+	var viewport_size := get_viewport_rect().size
+	# Full-screen dim
+	draw_rect(Rect2(Vector2.ZERO, viewport_size), BG_COLOR)
+
+	# Center box
+	var box_pos := Vector2(
+		(viewport_size.x - BOX_WIDTH) / 2.0,
+		(viewport_size.y - BOX_HEIGHT) / 2.0
+	)
+	var box_rect := Rect2(box_pos, Vector2(BOX_WIDTH, BOX_HEIGHT))
+	draw_rect(box_rect, Color(0.08, 0.08, 0.12, 0.95))
+	draw_rect(box_rect, BORDER_COLOR, false, 1.0)
+
+	# Title
+	var font := ThemeDB.fallback_font
+	draw_string(font,
+		box_pos + Vector2(PADDING, 24),
+		"WRONG — Describe the issue (Enter to save, Esc to cancel):",
+		HORIZONTAL_ALIGNMENT_LEFT, -1, LABEL_FONT_SIZE, TEXT_COLOR)
+
+
+# -- Public API ---------------------------------------------------------------
+
+func is_active() -> bool:
+	return _active

client/ui/bug_report_dialog.tscn

@@ -0,0 +1,14 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://ui/bug_report_dialog.gd" id="1_bugreport"]
+
+; #495: WRONG button (F12) — bug report capture dialog, ModalLayer
+[node name="BugReportDialog" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+mouse_filter = 2
+script = ExtResource("1_bugreport")