AtWithRho.java's get() method is not functioning as expected

[0pdd]

The puzzle 4673-7841412b from #4673 has to be resolved:

eo/eo-runtime/src/main/java/org/eolang/AtWithRho.java

Lines 19 to 25 in 0cd15b0

	* @todo #4673:30min The {@link AtWithRho#get()} is not thread safe. If multiple threads
	* call get() concurrently when the underlying object lacks RHO, each thread will:
	* 1. Pass the !ret.hasRho() check
	* 2. Create its own copy via ret.copy()
	* 3. Attempt to set RHO on its copy
	* This results in different threads receiving different copies, violating the expectation
	* that get() returns a consistent view of the attribute's value.

The puzzle was created by Rultor.com on 25-Nov-25.

Estimate: 30 minutes, role: DEV.

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