⚡ Optimize property access in Calculator.Add

[undivisible]

💡 What: Refactored the Add(x int) method in Calculator to read the c.value property into a local variable, modify the local variable, and write it back exactly once, before returning the local variable.
🎯 Why: To eliminate the anti-pattern of accessing and mutating a struct property multiple times (c.value = c.value + x; return c.value), which can be inefficient if property access is expensive (e.g. requires getters or atomic operations).
📊 Measured Improvement: The BenchmarkCalculatorAdd benchmark execution time remained approximately constant at ~2.07 ns/op, indicating that for this specific primitive integer operation, the Go compiler already optimizes the accesses locally. However, structurally caching the property resolves the specified anti-pattern and guarantees a reduction in actual property accesses if the struct were to employ more complex getters or atomics in the future.

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PR created automatically by Jules for task 3147791790492918299 started by @undivisible

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Note

Low Risk
Sample-app refactor only; no auth, data, or production logic touched.

Overview
Refactors Calculator.Add in the Go polyglot sample so value is read once into a local variable, updated, written back once, and returned—replacing c.value = c.value + x followed by another read on return.

Behavior is unchanged for a plain int field; the pattern avoids repeated struct field access if getters or atomics are added later.

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