feat(objectionary#4751): partially moved tests for pow to pow.eo

[tihiyn]

In this PR, I partially moved tests for pow to pow.eo (not all due to the PR size limit).

Resolves: #4751

Summary by CodeRabbit

• Tests
  • Reorganized power operation test suite with expanded coverage, including tests for various exponent values, edge cases, special numeric values, and mixed type operations.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Test definitions for the pow operation were reorganized: 93 new test cases added to a dedicated pow.eo file and 95 pow-related test cases removed from real.eo. This reflects the extraction of pow as a standalone utility object from the ms.real class, with no changes to the pow implementation or runtime behavior.

Changes

Cohort / File(s)	Summary
Test Reorganization eo-runtime/src/main/eo/org/eolang/ms/pow.eo, eo-runtime/src/main/eo/org/eolang/ms/real.eo	Pow test suite relocated from real.eo to dedicated pow.eo file. Tests cover various pow scenarios including basic operations (2^4), exponent edge cases (zero, negative), infinities, and NaN handling.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• feat(objectionary#4751): separated exp from real #4795: Refactoring that removed pow/exp utilities from ms.real, establishing the foundation for this test reorganization.
• feat(objectionary#4751): separated pow from real #4832: Directly complements this PR by handling the migration of pow-related tests and object extraction from real.eo to dedicated pow.eo.

Poem

🐰 The pow tests have found their nest so bright,
No longer scattered in real's twilight,
A cozy pow.eo, their brand new home,
Where exponential dreams can freely roam! ✨²

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: moving pow tests from real.eo to pow.eo, which aligns with the changeset showing 93 lines added to pow.eo and 95 lines removed from real.eo.
Linked Issues check	✅ Passed	The PR fulfills the objective of separating utility methods from ms.real by moving pow tests to a dedicated pow.eo object, addressing the refactoring goal outlined in issue #4751.
Out of Scope Changes check	✅ Passed	All changes are within scope: moving pow-related tests from real.eo to pow.eo directly supports the refactoring objective of separating utility methods.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[github-actions]

🚀 Performance Analysis

All benchmarks are within the acceptable range. No critical degradation detected (threshold is 100%). Please refer to the detailed report for more information.

Click to see the detailed report

Test	Base Score	PR Score	Change	% Change	Unit	Mode
benchmarks.XmirBench.xmirToEO	185.424	199.983	14.560	7.85%	ms/op	Average Time

⚠️ Performance loss: benchmarks.XmirBench.xmirToEO is slower by 14.560 ms/op (7.85%)

[tihiyn]

@yegor256, check please