chore: standardize license and package metadata; scanner/test fixes

Author: DevForge Engineer

src/deadcode/scanner.py

@@ -58,10 +58,14 @@ def unreferenced_components(self) -> list[Finding]:
 
 # ── Patterns ──────────────────────────────────────────────────────────
 
-# export const/let/var/function/class/type/interface/enum
+# export const/let/var/function/class/type/interface/enum.
+# Deliberately does NOT match `export default ...`: with `default` in the
+# alternation the capture group grabbed the keyword `function`/`class` as
+# the export name, flagging every default export as removable dead code.
+# Default exports are entry-point conventions and are skipped entirely.
 _EXPORT_PATTERN = re.compile(
     r"^\s*export\s+"
-    r"(?:const|let|var|function|class|type|interface|enum|default)\s+"
+    r"(?:const|let|var|function|class|type|interface|enum)\s+"
     r"([A-Za-z_$][\w$]*)",
     re.MULTILINE,
 )

tests/test_config_and_fixes.py

@@ -517,7 +517,10 @@ def test_ruff_known_first_party(self):
         """ruff known-first-party should be ['deadcode'], not ['*']."""
         from pathlib import Path
 
-        import tomllib
+        try:
+            import tomllib
+        except ModuleNotFoundError:  # Python 3.10 (requires-python >= 3.10)
+            import tomli as tomllib
 
         pyproject = Path(__file__).parent.parent / "pyproject.toml"
         with open(pyproject, "rb") as f:
@@ -530,7 +533,10 @@ def test_package_data_includes_py_typed(self):
         """pyproject.toml should have package-data config for py.typed."""
         from pathlib import Path
 
-        import tomllib
+        try:
+            import tomllib
+        except ModuleNotFoundError:  # Python 3.10 (requires-python >= 3.10)
+            import tomli as tomllib
 
         pyproject = Path(__file__).parent.parent / "pyproject.toml"
         with open(pyproject, "rb") as f: