fix sessions dir from state env

what: use CLAWDBOT_STATE_DIR/CLAWDIS_STATE_DIR for session transcripts

why: isolate multi-instance gateways

tests: not run

src/config/paths.ts

@@ -27,8 +27,9 @@ export function resolveStateDir(
   env: NodeJS.ProcessEnv = process.env,
   homedir: () => string = os.homedir,
 ): string {
-  const override = env.CLAWDBOT_STATE_DIR?.trim();
-  if (override) return override;
+  const override =
+    env.CLAWDBOT_STATE_DIR?.trim() || env.CLAWDIS_STATE_DIR?.trim();
+  if (override) return resolveUserPath(override);
   return path.join(homedir(), ".clawdbot");
 }