fix(ci): normalize path separators in blast radius summaries (#82)

* fix(ci): normalize path separators in blast radius summaries

path.display() uses native separators, producing backslashes on Windows.
Since these paths appear in review comments (web UI), normalize to
forward slashes so the output is consistent across platforms.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* test: add unit test for backslash path normalization in blast radius

Directly tests format_blast_radius_summary with Windows-style backslash
paths to verify they are normalized to forward slashes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: haasonsaas

src/review/pipeline/postprocess/blast_radius.rs

@@ -45,7 +45,7 @@ fn format_blast_radius_summary(dependents: &[PathBuf]) -> String {
     let listed = dependents
         .iter()
         .take(MAX_LISTED_DEPENDENTS)
-        .map(|path| path.display().to_string())
+        .map(|path| path.display().to_string().replace('\\', "/"))
         .collect::<Vec<_>>();
     let remaining = dependents.len().saturating_sub(listed.len());
 
@@ -140,6 +140,35 @@ mod tests {
         assert!(comments[0].tags.iter().any(|tag| tag == "blast-radius:3"));
     }
 
+    #[test]
+    fn format_blast_radius_summary_normalizes_backslash_paths() {
+        use super::format_blast_radius_summary;
+
+        let dependents = vec![
+            PathBuf::from("src\\a.rs"),
+            PathBuf::from("src\\b.rs"),
+            PathBuf::from("src\\c.rs"),
+        ];
+
+        let summary = format_blast_radius_summary(&dependents);
+        assert!(
+            summary.contains("src/a.rs"),
+            "expected forward slashes in summary, got: {summary}"
+        );
+        assert!(
+            summary.contains("src/b.rs"),
+            "expected forward slashes in summary, got: {summary}"
+        );
+        assert!(
+            summary.contains("src/c.rs"),
+            "expected forward slashes in summary, got: {summary}"
+        );
+        assert!(
+            !summary.contains('\\'),
+            "summary should not contain backslashes: {summary}"
+        );
+    }
+
     #[test]
     fn skips_blast_radius_summary_below_threshold() {
         let dir = tempfile::tempdir().unwrap();