Ship the 0.8.0 first-hour and campaign milestone

Add the campaign shell, pause-safe checkpoint resume, post-shift campaign
continue, confirmed campaign reset, difficulty presets, searchable Help,
content-matrix validation, recovery events, contextual dialogue, policy/debrief
context and eligible-event previews. Extend persistence with atomic separate
files and add campaign/checkpoint/tutorial smokes. Headless 247/247, Python
94/94, tutorial/campaign/session/scenario smokes green.

src/game/ui/start_menu.gd

@@ -5,6 +5,8 @@ extends CanvasLayer
 ## (the `V` bind stays as a debug shortcut).
 
 signal venue_selected(scenario_id: String)
+signal continue_requested()
+signal help_requested()
 signal settings_requested()
 signal quit_requested()
 
@@ -19,6 +21,9 @@ const VENUES := [
 var _index := 0
 var _buttons: Array[Button] = []
 var _root: Control = null
+var _status: Label = null
+var _continue_button: Button = null
+var _campaign: Dictionary = {}
 
 func _ready() -> void:
 	layer = 20
@@ -88,6 +93,20 @@ func _build() -> void:
 	subtitle.add_theme_color_override("font_color", Color(0.72, 0.75, 0.82))
 	column.add_child(subtitle)
 
+	_status = Label.new()
+	_status.name = "CampaignStatus"
+	_status.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
+	_status.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
+	_status.add_theme_color_override("font_color", Color(0.62, 0.78, 0.9))
+	column.add_child(_status)
+
+	_continue_button = Button.new()
+	_continue_button.name = "ContinueButton"
+	_continue_button.custom_minimum_size = Vector2(460, 52)
+	_continue_button.pressed.connect(_on_continue_pressed)
+	_style_venue_button(_continue_button)
+	column.add_child(_continue_button)
+
 	for i in VENUES.size():
 		var venue: Dictionary = VENUES[i]
 		var button := Button.new()
@@ -109,6 +128,12 @@ func _build() -> void:
 	row.add_theme_constant_override("separation", 12)
 	column.add_child(row)
 
+	var help_button := Button.new()
+	help_button.name = "HelpButton"
+	help_button.text = "Help"
+	help_button.pressed.connect(func(): help_requested.emit())
+	row.add_child(help_button)
+
 	var settings_button := Button.new()
 	settings_button.name = "SettingsButton"
 	settings_button.text = "Settings"
@@ -164,12 +189,35 @@ func _focus_index(i: int) -> void:
 	_index = clampi(i, 0, _buttons.size() - 1)
 	_buttons[_index].grab_focus()
 
-func open() -> void:
+func open(campaign: Dictionary = {}) -> void:
+	_campaign = campaign.duplicate(true)
 	visible = true
 	_root.visible = true
 	Input.set_mouse_mode(Input.MOUSE_MODE_VISIBLE)
+	var next_id := str(_campaign.get("next_venue", ""))
+	var complete := bool(_campaign.get("complete", false))
+	if _status:
+		if complete:
+			_status.text = "Campaign complete — pick any venue for a free shift."
+		elif next_id != "":
+			_status.text = "Campaign shift %d · next: %s" % [
+				int(_campaign.get("shift_number", 1)), _venue_label(next_id)]
+	if _continue_button:
+		var next_label := _venue_label(next_id)
+		_continue_button.text = "Continue shift — %s" % next_label if next_id != "" else "Campaign complete"
+		_continue_button.visible = not complete
 	_focus_index(_index)
 
+func _venue_label(id: String) -> String:
+	for venue in VENUES:
+		if str(venue["id"]) == id:
+			return str(venue["label"])
+	return id.replace("_", " ").capitalize()
+
+func _on_continue_pressed() -> void:
+	close()
+	continue_requested.emit()
+
 func close() -> void:
 	visible = false
 	_root.visible = false