feat(client): character select, triangle activation consumer, news ticker

Sprint 24 Signal — three client tickets delivering the player-facing
storyteller feedback loop:

- #588: Character archetype select screen between New Game and session
  start. Two-card UI (Smuggler/Detective), keyboard+mouse, ESC cancels.
  GameState.character_archetype persisted and sent in StartupMessage.
  PROTOCOL_VERSION bumped to 19.
- #590: Triangle crisis event consumer. Decodes triangle_crisis_events
  from snapshot, fires sfx_monologue_chime_urgent once per triangle per
  session via AudioManager.CHIME_ACTIVATION.
- #592: News ticker HUD element. Scrolling marquee on UILayer, visible
  only when current_ticker is present in snapshot (Last Shift zone).
  Zero-arg update_from_state reads from GameState.current_snapshot.

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

client/scripts/autoloads/session_manager.gd

@@ -47,11 +47,12 @@ func new_game() -> String:
 
 
 ## Resume an existing game session by setting the active game-id.
-## Restores world_seed from the save directory for D-010 deterministic replay.
+## Restores world_seed and character_archetype from the save directory.
 func resume_game(game_id: String) -> void:
 	GameState.current_game_id = game_id
 	var save_path := SAVES_DIR + game_id + "/"
 	GameState.world_seed = _read_seed_file(save_path)
+	GameState.character_archetype = _read_archetype_file(save_path)
 
 
 ## List all game directories under user://saves/ sorted by last-modified (most recent first).
@@ -146,6 +147,24 @@ func _read_seed_file(save_path: String) -> int:
 	return file.get_64() & 0x7FFFFFFFFFFFFFFF
 
 
+## Write character_archetype to save directory. Called after new_game() creates the dir.
+func save_character_archetype(game_id: String, archetype: String) -> void:
+	var save_path := SAVES_DIR + game_id + "/"
+	var file := FileAccess.open(save_path + "character.txt", FileAccess.WRITE)
+	if file == null:
+		push_error("SessionManager: failed to write character.txt: %s" % error_string(FileAccess.get_open_error()))
+		return
+	file.store_string(archetype)
+
+
+## Read character_archetype from save directory. Returns "detective" if missing (legacy saves).
+func _read_archetype_file(save_path: String) -> String:
+	var file := FileAccess.open(save_path + "character.txt", FileAccess.READ)
+	if file == null:
+		return "detective"
+	return file.get_as_text().strip_edges()
+
+
 func _find_newest_save(dir_path: String) -> String:
 	var dir := DirAccess.open(dir_path)
 	if dir == null: