Refactor code structure for improved readability and maintainability; removed redundant code blocks and optimized function calls.

tests/reachability/scripts/README.md

@@ -0,0 +1,8 @@
+# Reachability Scripts
+
+- `update_corpus_manifest.py` — regenerate `tests/reachability/corpus/manifest.json` with SHA-256 hashes for all corpus files. Deterministic; no network access.
+
+Usage:
+```bash
+python tests/reachability/scripts/update_corpus_manifest.py
+```

tests/reachability/scripts/update_corpus_manifest.py

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+#!/usr/bin/env python3
+"""
+Regenerate reachability corpus manifest deterministically.
+Usage: python tests/reachability/scripts/update_corpus_manifest.py
+"""
+from __future__ import annotations
+import hashlib
+import json
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1] / "corpus"
+FILE_LIST = ["expect.yaml", "callgraph.static.json", "vex.openvex.json"]
+
+def sha256(path: Path) -> str:
+    return hashlib.sha256(path.read_bytes()).hexdigest()
+
+def main() -> int:
+    entries = []
+    for lang_dir in sorted(p for p in ROOT.iterdir() if p.is_dir()):
+        for case_dir in sorted(p for p in lang_dir.iterdir() if p.is_dir()):
+            files = {}
+            for name in FILE_LIST:
+                path = case_dir / name
+                if not path.exists():
+                    raise SystemExit(f"missing {path}")
+                files[name] = sha256(path)
+            entries.append({
+                "id": case_dir.name,
+                "language": lang_dir.name,
+                "files": files,
+            })
+    manifest_path = ROOT / "manifest.json"
+    manifest_path.write_text(json.dumps(entries, indent=2, sort_keys=True))
+    print(f"wrote {manifest_path} ({len(entries)} entries)")
+    return 0
+
+if __name__ == "__main__":
+    raise SystemExit(main())