Fix PurePath.match intercepting absolute shebang paths#349
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…bare name rules `PurePath.match()` performs right-aligned suffix matching, which caused absolute shebang paths (e.g., `C:\uv\python.exe`) to inadvertently evaluate true for bare names like `python.exe` or `python*.exe`. This resulted in two critical bugs: 1. Virtual environment paths were hijacked by the `is_default` trap, falling back to the global default Python runtime instead of the specified one. 2. Custom executables (like `python_uv_test.exe`) were intercepted by the fallback wildcard search, resulting in arbitrary slicing and lookup errors for phantom version tags (e.g., `_uv_test`). This commit introduces an `is_name_only` check (validating the absence of directory separators `/` and `\`) to safely distinguish bare commands from explicit paths. Gating the `is_default`, virtual alias, and wildcard extraction logic behind this check ensures explicit paths correctly fall through to `_find_on_path()`.
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Fixes #348
Addresses #307 and #91
Per #345, resubmitting now that the issue has been filed.
This gates virtual alias matching and wildcard string-slicing behind an is_name_only check so explicit absolute paths cleanly fall through to _find_on_path.