refactor(turn): drop section-banner comments in turn_facade_lease

agent/turn_facade_lease.py

@@ -42,8 +42,6 @@ class DurableTurnLease:
     def _current_session_id(self) -> str:
         return getattr(self.agent, "session_id", None) or self.session_id
 
-    # ── thread construction ──────────────────────────────────────────────────────
-
     def build_threads(self) -> None:
         """Create (not start) the refresher thread and, when configured, the liveness watchdog.
 
@@ -76,8 +74,6 @@ class DurableTurnLease:
                 deactivate_turn=self.deactivate_after_liveness_abort,
             ).make_thread()
 
-    # ── lifecycle ────────────────────────────────────────────────────────────────
-
     def start(self) -> None:
         with self._lock:
             self.turn_active = True
@@ -113,8 +109,6 @@ class DurableTurnLease:
         with self._lock:
             return self.turn_active
 
-    # ── interrupts ───────────────────────────────────────────────────────────────
-
     def _interrupt_turn(self, message: str) -> None:
         # Lease-loss interrupts fire UNCONDITIONALLY (no generation claim): a lost lease means this
         # process no longer owns the session. Only the watchdog's stalls can be spuriously stale.
@@ -203,8 +197,6 @@ class DurableTurnLease:
             with redirect_lock:
                 _clear_if_owned()
 
-    # ── refresher thread body ────────────────────────────────────────────────────
-
     def refresh_loop(self) -> None:
         """Renew the lease every ``refresh_interval``; a miss or error interrupts the turn.