fix(test-style): avoid escaping test-unit name regex

[Kemalau]

What changed

• stop shell-escaping the Test::Unit --name regex when building run-in-terminal commands
• add a regression test that locks the Windows-safe command shape for a single example

Why

Shellwords.escape is correct for file paths and shell arguments, but it over-escapes the regex passed to Test::Unit's --name flag. On Windows this turns the trailing $ into \\$, so the generated command matches nothing and "Run Test in Terminal" reports zero tests.

Verification

• Added a focused regression test in test/requests/resolve_test_commands_test.rb
• I could not run the Ruby test suite in this environment because ruby/bundle are not installed here; the fix is based on the existing failing expectation pattern reported in the issue and the local diff review.