Reorganize StrataTest/Languages/Core/ into Examples/ and Tests/

[shigoel]

Summary

• Moves all files that were directly under StrataTest/Languages/Core/ into a new Core/Tests/ subdirectory
• Moves behavior/regression-focused files from Core/Examples/ into Core/Tests/ (e.g. DatatypeTypingTests, IfElsePrecedenceTest, PrecedenceCheck, etc.)
• Leaves feature showcase files in Core/Examples/ (e.g. Min, Map, SimpleProc, Loops, FreeRequireEnsure, UnreachableAssert, etc.)
• No code changes — renames only; StrataTest uses globs = ["StrataTest.+"] so all files are auto-discovered

🤖 Generated with Claude Code

[joscoh]

Arguably PolymorphicDatatypeTest.lean, PolymorphicFunctionTest.lean, and RecursiveFunctionTests.lean could go in the Examples/ directory since they demonstrate how to use polymorphic functions, datatypes, and recursive functions, respectively. But they consist of several examples (unlike most in the Examples/ directory) and some parts are unit-test-like, so it's probably fine.

[shigoel]

Arguably PolymorphicDatatypeTest.lean, PolymorphicFunctionTest.lean, and RecursiveFunctionTests.lean could go in the Examples/ directory since they demonstrate how to use polymorphic functions, datatypes, and recursive functions, respectively. But they consist of several examples (unlike most in the Examples/ directory) and some parts are unit-test-like, so it's probably fine.

Indeed -- I thought those were noisy and not showcase-y enough for Examples/. We should probably add good representative examples in the Examples/ directory, and I'm hoping this separation will help us exercise judgement there.

[MikaelMayer]

The file path for unit tests now contains 3 times the word Test. Reminds me of Dafny which had Tests/LitTests/LitTest .
I don't have a better alternative as I do like to see in my IDE that a file ends with Test as the path is not visible.