feat(notifications): add bump mode + russify Telegram live-tracker

ORCH-042: new ORCH_TRACKER_MODE (Settings.tracker_mode, default edit) selects
the live-tracker card behaviour. bump mode re-creates the card at the bottom of
the chat on every update (delete_telegram + send silently + repoint message_id),
keeping the "one card per task" invariant: <=1 new message per call, repoint
only on successful send, delete result never gates the send. New never-raising
delete_telegram helper. Anything != "bump" resolves to edit (zero regression).

Also russify/cosmetic-fix the card text (both modes): "Подтверждение BRD" label,
✅ after approve-gate, Russian stage labels, "📦 Внедрено". Docs updated in the
same PR (CHANGELOG, internals.md, .env.example).

Refs: ORCH-042

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/config.py

@@ -134,6 +134,14 @@ class Settings(BaseSettings):
     telegram_bot_token: str = ""
     telegram_chat_id: str = ""
 
+    # ORCH-042: режим live-трекера задачи.
+    #   edit -> карточка редактируется на месте (editMessageText), ДЕФОЛТ (как было).
+    #   bump -> при обновлении старое сообщение удаляется и карточка отправляется
+    #           заново вниз чата (deleteMessage + sendMessage + repoint message_id),
+    #           тихо (disable_notification). Одна карточка на задачу в обоих режимах.
+    # Неизвестное/пустое значение трактуется как edit (см. notifications).
+    tracker_mode: str = "edit"
+
     class Config:
         env_prefix = "ORCH_"
         env_file = ".env"