Stabilize paired-room orchestration and Codex app-server flow

setup/register.ts

@@ -106,16 +106,18 @@ export async function run(args: string[]): Promise<void> {
   const db = new Database(dbPath);
   // Ensure schema exists
   db.exec(`CREATE TABLE IF NOT EXISTS registered_groups (
-    jid TEXT PRIMARY KEY,
+    jid TEXT NOT NULL,
     name TEXT NOT NULL,
-    folder TEXT NOT NULL UNIQUE,
+    folder TEXT NOT NULL,
     trigger_pattern TEXT NOT NULL,
     added_at TEXT NOT NULL,
     container_config TEXT,
     requires_trigger INTEGER DEFAULT 1,
     is_main INTEGER DEFAULT 0,
-    agent_type TEXT DEFAULT 'claude-code',
-    work_dir TEXT
+    agent_type TEXT NOT NULL DEFAULT 'claude-code',
+    work_dir TEXT,
+    PRIMARY KEY (jid, agent_type),
+    UNIQUE (folder, agent_type)
   )`);
 
   try {