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This PR completes the refactoring of test helpers started in PR #578 by removing direct imports from the `libtmux.test` root module. Users must now import from specific submodules like `libtmux.test.named` and `libtmux.test.constants`.
Improvements include:
- Enhanced `EnvironmentVarGuard` for more reliable environment variable handling
- Added comprehensive test suites for constants and environment utilities
- Improved code coverage with proper exclusion markers for type checking blocks
- Better docstrings and examples in the random module
These changes improve maintainability and robustness of test helpers that are used both internally and by downstream packages that depend on libtmux.