fix(cli): reject zero and negative --timeout values

Replace NaN-only guard with `> 0` which also rejects zero, negative,
and NaN values — all of which cause immediate spurious timeouts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: sirtimid

packages/cli/src/app.ts

@@ -275,7 +275,7 @@ const yargsInstance = yargs(hideBin(process.argv))
             await handleDaemonExec(
               execArgs,
               socketPath,
-              typeof args.timeout === 'number' && !Number.isNaN(args.timeout)
+              typeof args.timeout === 'number' && args.timeout > 0
                 ? { timeoutMs: args.timeout * 1000 }
                 : {},
             );