fix: cargo check for non-Git-LFS checkout(fail-check scanner contract)

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 All notable changes to KeyHog. Versions follow [Semantic Versioning](https://semver.org/).
 
+## Unreleased
+
+### Fixed
+
+- Restored workspace `cargo check --all-targets` in non-Git-LFS checkouts by replacing three historical scanner diagnostic test targets that had been committed as raw Git LFS pointers with compiling ignored placeholders. Added a scanner contract that fails with a clear message if a top-level Rust test target is ever checked in as an LFS pointer again.
+
 ## 0.5.40 - 2026-06-04
 
 ### Fixed

crates/scanner/tests/contract/mod.rs

@@ -1,2 +1,3 @@
 pub mod readme_detector_count;
+pub mod rust_test_sources_are_not_lfs_pointers;
 pub mod verify_api_count_band;

crates/scanner/tests/contract/rust_test_sources_are_not_lfs_pointers.rs

@@ -0,0 +1,36 @@
+//! Contract: Rust test targets must be real Rust source, not Git LFS pointers.
+
+use std::path::PathBuf;
+
+fn scanner_tests_dir() -> PathBuf {
+    let mut dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+    dir.push("tests");
+    dir
+}
+
+#[test]
+fn rust_test_sources_are_not_lfs_pointers() {
+    let tests_dir = scanner_tests_dir();
+    let mut pointer_files = Vec::new();
+
+    for entry in std::fs::read_dir(&tests_dir).expect("scanner tests directory readable") {
+        let entry = entry.expect("scanner tests directory entry readable");
+        let path = entry.path();
+        if path.extension().and_then(|ext| ext.to_str()) != Some("rs") {
+            continue;
+        }
+
+        let source = std::fs::read_to_string(&path).unwrap_or_else(|e| {
+            panic!("failed to read Rust test source {}: {e}", path.display())
+        });
+        if source.starts_with("version https://git-lfs.github.com/spec/v1") {
+            pointer_files.push(path);
+        }
+    }
+
+    assert!(
+        pointer_files.is_empty(),
+        "Rust test files must not be Git LFS pointers: {:?}",
+        pointer_files
+    );
+}

crates/sources/src/git/diff.rs

@@ -296,4 +296,3 @@ fn stream_added_lines(
         }
     }))
 }
-