feat(release): synthesize initial catalog entries

tools/release/govoplan_release/contracts.py

@@ -331,6 +331,11 @@ def import_source_path(path: Path, *, module: str | None, level: int) -> Path |
         if src_root is None or module is None:
             return None
         candidate = src_root.joinpath(*module.split(".")).with_suffix(".py")
+        if not candidate.exists():
+            top_level = module.split(".", 1)[0]
+            workspace = src_root.parent.parent
+            sibling_src = workspace / top_level.replace("_", "-") / "src"
+            candidate = sibling_src.joinpath(*module.split(".")).with_suffix(".py")
     if candidate.exists():
         return candidate
     init = candidate.with_suffix("") / "__init__.py"