fix: allow multiple todo continuations per session (#164)

Previously, remindedSessions was only cleared when assistant finished
with finish=true. If agent stopped mid-task (ESC, error), the session
stayed 'reminded' forever, preventing future continuations.

Now also clears remindedSessions when user sends a new message,
allowing continuation to trigger again after user interaction.

src/hooks/todo-continuation-enforcer.ts

@@ -279,6 +279,8 @@ export function createTodoContinuationEnforcer(ctx: PluginInput): TodoContinuati
           pendingCountdowns.delete(sessionID)
           log(`[${HOOK_NAME}] Cancelled countdown on user message`, { sessionID })
         }
+        // Allow new continuation after user sends another message
+        remindedSessions.delete(sessionID)
       }
 
       if (sessionID && role === "assistant" && finish) {