refactor: dedupe bluebubbles and zalouser readers

scripts/debug-claude-usage.ts

@@ -3,6 +3,7 @@ import crypto from "node:crypto";
 import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
+import { normalizeOptionalString } from "../src/shared/string-coerce.ts";
 
 type Args = {
   agentId: string;
@@ -36,7 +37,7 @@ const parseArgs = (): Args => {
       continue;
     }
     if (arg === "--session-key" && args[i + 1]) {
-      sessionKey = String(args[++i]).trim() || undefined;
+      sessionKey = normalizeOptionalString(String(args[++i]));
       continue;
     }
   }