fix(release): reject unpackageable tagged artifacts

tests/test_version_alignment.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import json
 from pathlib import Path
+import subprocess
 import sys
 import tempfile
 import unittest
@@ -179,6 +180,46 @@ class VersionAlignmentTests(unittest.TestCase):
         self.assertEqual("1.2.3", issues[0].expected)
         self.assertEqual("1.2.4", issues[0].actual)
 
+    def test_release_refs_must_point_at_installable_versioned_artifacts(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            workspace = Path(tmp)
+            meta = workspace / "govoplan"
+            core = workspace / "govoplan-core"
+            module = workspace / "govoplan-example"
+            meta.mkdir()
+            (core / "webui").mkdir(parents=True)
+            module.mkdir()
+            (meta / "requirements-release.txt").write_text(
+                "govoplan-example @ git+ssh://git@example.test/acme/govoplan-example.git@v1.2.3\n"
+            )
+            (core / "webui" / "package.release.json").write_text(
+                json.dumps(
+                    {
+                        "dependencies": {
+                            "@govoplan/example-webui": (
+                                "git+ssh://git@example.test/acme/govoplan-example.git#v1.2.3"
+                            )
+                        }
+                    }
+                )
+            )
+            subprocess.run(["git", "init", "-q", str(module)], check=True)
+            subprocess.run(["git", "-C", str(module), "config", "user.email", "test@example.test"], check=True)
+            subprocess.run(["git", "-C", str(module), "config", "user.name", "Test"], check=True)
+            (module / "README.md").write_text("uninstallable release\n")
+            subprocess.run(["git", "-C", str(module), "add", "README.md"], check=True)
+            subprocess.run(["git", "-C", str(module), "commit", "-qm", "release"], check=True)
+            subprocess.run(["git", "-C", str(module), "tag", "v1.2.3"], check=True)
+
+            issues = release_composition_issues(meta, core_root=core)
+
+        self.assertEqual(2, len(issues))
+        self.assertEqual(
+            {"v1.2.3:pyproject.toml", "v1.2.3:webui/package.json"},
+            {issue.source for issue in issues},
+        )
+        self.assertTrue(all("must contain" in issue.message for issue in issues))
+
 
 if __name__ == "__main__":
     unittest.main()