* Test nested Windows CSP candidate paths
Regression coverage for #761 before the path-normalization fix.
AI assistance: Codex, under maintainer direction.
* Fix Windows CSP candidate path normalization
Normalize native relative paths before slash-based CSP classification and signal output. Preserve literal Unix backslashes.
AI assistance: Codex, under maintainer direction.
* Avoid reusing stale CSP test fixtures
Retry an unused test directory on AlreadyExists without deleting or reading any pre-existing fixture contents.
AI assistance: Codex, under maintainer direction.