feat: combine multipleOf errors into a single message

[Sam-61s]

Combine multiple failing multipleOf constraints at the same instance location
into a single error message by computing their LCM. Tests included.

Closes #139

[jdesrosiers]

Great start. I've asked for a couple refinements inline.

[jdesrosiers]

Good test! But, this needs a better name. This is checking the LCM logic right?

[jdesrosiers]

Why'd you delete this test? This was a necessary test for the LCM logic. It just needed a better name. The other test is not sufficient to test LCM. An implementation that naively multiplied the value of all multipleOf values would pass that test. This test would catch that bug.

[Sam-61s]

Hii @jdesrosiers,
I think I've resolved all the inline refinements.

Updated multipleOf handler to combine constraints as we iterate.
Adjusted the tests in multipleOf.json to keep only the essential case and renamed the combined test to clearly reflect the LCM behavior.

Please let me know if you’d like any further changes.

[Sam-61s]

@jdesrosiers I've added the test with multipleOf: 4, 6, 8 to catch the multiplication bug. Should I keep both tests (the 3, 2 case and the 4, 6, 8 case), or remove the 3, 2 test and keep only the 4, 6, 8 one? The 3, 2 test is a simpler two-value case, but the 4, 6, 8 test already validates LCM. What do you prefer?

[jdesrosiers]

Just the one test might be enough. I can't think of a case where the 2-value case would fail but the 3-value would pass. I think just the three-value case would be fine.

[Sam-61s]

I’ve kept only the three-value test case (multipleOf: 4, 6, 8) to validate proper LCM handling and catch the multiplication bug.
Please let me know if anything else needs tweaking.

[jdesrosiers]

Thanks!