Fix: ensure defuzzified value is at least 1D

[jcrada]

Issue: fuzzylite/help#14

Problem: defuzzified value is a single scalar, which cannot be iterated upon to lock previous values

Solution: make sure any defuzzified value is at least 1D.

Requirements

• HISTORY file is updated
• Code is tested
• Documentation is updated

[codspeed-hq]

CodSpeed Performance Report

Merging #95 will improve performances by 17.41%

_{Comparing fix-locking-numpy (b18c722) with main (af9b368)¹}

Summary

⚡ 1 improvement
✅ 21 untouched

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_arc	9.2 ms	7.9 ms	+17.41%

Footnotes

1. No successful run was found on main (a02403e) during the generation of this report, so af9b368 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩