fix: preserve Windows drive-letter and colon-containing paths when parsing import artifact flags

[aniket866]

Fixed the import flag parser: it now strips only a trailing parseable boolean suffix, preserving Windows drive letters and other colons in file paths.

verification:

• A small regression test is warranted for this parser bug, especially because the key case is Windows-specific but the parsing is platform-independent, the tiny parsing step so a table-driven test can cover the Windows path, :false, relative paths, and a colon-containing filename; no broader test scaffolding.

AI disclosure : ChatGpt is used to analyze related files and changes.

Closes #352