Normalize backslashes in temp path for Windows compatibility

On Windows, canonicalize() returns paths with backslashes but git
stores URLs with forward slashes. Convert backslashes to forward
slashes before stripping the temp path prefix.

Prompts:
- "windows failed - https://github.com/timabell/gitopolis/actions/runs/19770885497/job/56654534705 ..."

Co-Authored-By: Claude <noreply@anthropic.com>

Author: timabell

tests/end_to_end_tests.rs

@@ -2604,8 +2604,9 @@ url = "source_zzz"
 
 	// git clone converts relative local paths to absolute, so strip the temp path prefix
 	// Use canonicalize to resolve symlinks (e.g., /var -> /private/var on macOS)
+	// On Windows, canonicalize uses backslashes but git uses forward slashes, so normalize
 	let temp_path_canonical = temp.path().canonicalize().unwrap();
-	let temp_path_str = temp_path_canonical.to_str().unwrap();
+	let temp_path_str = temp_path_canonical.to_str().unwrap().replace('\\', "/");
 	let remotes = remotes.replace(&format!("{}/", temp_path_str), "");
 
 	let expected_remotes = r#"aaa	source_aaa (fetch)
@@ -2665,8 +2666,9 @@ url = "source_bbb"
 
 	// git clone converts relative local paths to absolute, so strip the temp path prefix
 	// Use canonicalize to resolve symlinks (e.g., /var -> /private/var on macOS)
+	// On Windows, canonicalize uses backslashes but git uses forward slashes, so normalize
 	let temp_path_canonical = temp.path().canonicalize().unwrap();
-	let temp_path_str = temp_path_canonical.to_str().unwrap();
+	let temp_path_str = temp_path_canonical.to_str().unwrap().replace('\\', "/");
 	let remotes = remotes.replace(&format!("{}/", temp_path_str), "");
 
 	// Should have aaa and bbb remotes, NOT origin