fix: remove duplicate path_routing_tests module in memory.rs

After rebase, the path_routing_tests test module appeared twice in
memory.rs -- once before MemoryTreeTool and once at the end. Remove
the first occurrence to fix the compilation error.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

src/tools/builtin/memory.rs

@@ -539,26 +539,6 @@ impl Tool for MemoryTreeTool {
     }
 }
 
-#[cfg(test)]
-mod path_routing_tests {
-    use super::looks_like_filesystem_path;
-
-    #[test]
-    fn detects_filesystem_paths() {
-        assert!(looks_like_filesystem_path("/Users/nige/file.md"));
-        assert!(looks_like_filesystem_path("C:\\Users\\nige\\file.md"));
-        assert!(looks_like_filesystem_path("D:/work/file.md"));
-        assert!(looks_like_filesystem_path("~/notes.md"));
-    }
-
-    #[test]
-    fn allows_workspace_memory_paths() {
-        assert!(!looks_like_filesystem_path("MEMORY.md"));
-        assert!(!looks_like_filesystem_path("daily/2026-03-11.md"));
-        assert!(!looks_like_filesystem_path("projects/alpha/notes.md"));
-    }
-}
-
 #[cfg(all(test, feature = "postgres"))]
 mod tests {
     use super::*;