fix(client): address PR #86 review — archetype validation, teleport clear, ticker layout

- protocol.gd: replace capitalize() with explicit match for archetype
  string mapping, push_error on unknown input with Detective fallback
- main.gd: clear _known_triangle_ids in _teleport_transition() alongside
  _known_recognition_ids so chime re-fires after room change
- news_ticker.gd: defer get_minimum_size() via call_deferred to run
  after layout pass, fixing first-frame scroll distance
- 3 new tests: unknown archetype fallback, triangle dedup per-id,
  independent triangle ID firing

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

client/scripts/main.gd

@@ -575,6 +575,7 @@ func _teleport_transition() -> void:
 	GameState.current_dialogue = null
 	GameState.dialogue_active = false
 	_known_recognition_ids.clear()  # D-067: reset chimes for new room
+	_known_triangle_ids.clear()     # #590: reset activation chimes for new room
 	if dialogue_box and dialogue_box.is_dialogue_active():
 		dialogue_box.hide_dialogue()