The delta_blue benchmark was updated to run 40 iterations instead of 20 in both the Python and Wren implementations, and the expected benchmark result was adjusted from 7032700 to 14065400 to match the doubled workload. Additionally, the Wren source was cleaned up by removing forward declaration placeholders for global variables and converting them to proper `var` declarations with immediate initialization.
The benchmark directory is relocated from the project root into the test directory, and all scripts, documentation links, and gitignore paths are updated accordingly. The test runner is also refactored to explicitly walk subdirectories (core, io, language, limit) instead of using a single test root, and a new test/README.md is added to document the test suite structure. Additionally, the constructor test for the Foo class is updated to add a zero-arity constructor and adjust expected output strings.
