fix(import[provenance]): Convert string entries to dict form for SKIP_UNCHANGED tagging

why: String-form config entries (e.g. "git+ssh://...") silently skip provenance
tagging due to the isinstance(live, dict) guard, breaking future --prune for those
entries.
what:
- Mirror the UPDATE_URL pattern: when live is a string, convert it to dict form
  {"repo": live, "metadata": {"imported_from": ...}} before stamping provenance
- Add test_import_skip_unchanged_tags_provenance_string_entry verifying string
  entries get converted and tagged

Author: tony

src/vcspull/cli/import_cmd/_common.py

@@ -962,6 +962,12 @@ def _run_import(
                 if isinstance(live, dict):
                     live.setdefault("metadata", {})["imported_from"] = import_source
                     provenance_tagged_count += 1
+                elif isinstance(live, str):
+                    raw_config[repo_workspace_label][repo.name] = {
+                        "repo": live,
+                        "metadata": {"imported_from": import_source},
+                    }
+                    provenance_tagged_count += 1
         elif action == ImportAction.SKIP_EXISTING:
             skip_existing_count += 1
         elif action == ImportAction.SKIP_PINNED:

tests/cli/test_import_repos.py

@@ -3453,6 +3453,56 @@ def test_import_skip_unchanged_tags_provenance(
     assert entry["metadata"]["imported_from"] == "github:testuser"
 
 
+def test_import_skip_unchanged_tags_provenance_string_entry(
+    tmp_path: pathlib.Path,
+    monkeypatch: MonkeyPatch,
+) -> None:
+    """SKIP_UNCHANGED converts string entries to dict form for provenance."""
+    monkeypatch.setenv("HOME", str(tmp_path))
+    workspace = tmp_path / "repos"
+    workspace.mkdir()
+    config_file = tmp_path / ".vcspull.yaml"
+
+    # Existing entry as a plain string (not dict form)
+    save_config_yaml(
+        config_file,
+        {"~/repos/": {"repo1": _SSH}},
+    )
+
+    # Same URL → SKIP_UNCHANGED, should convert to dict and stamp provenance
+    importer = MockImporter(repos=[_make_repo("repo1")])
+    _run_import(
+        importer,
+        service_name="github",
+        target="testuser",
+        workspace=str(workspace),
+        mode="user",
+        language=None,
+        topics=None,
+        min_stars=0,
+        include_archived=False,
+        include_forks=False,
+        limit=100,
+        config_path_str=str(config_file),
+        dry_run=False,
+        yes=True,
+        output_json=False,
+        output_ndjson=False,
+        color="never",
+        sync=True,
+        import_source="github:testuser",
+    )
+
+    from vcspull._internal.config_reader import ConfigReader
+
+    final_config = ConfigReader._from_file(config_file)
+    assert final_config is not None
+    entry = final_config["~/repos/"]["repo1"]
+    assert isinstance(entry, dict), "String entry should be converted to dict form"
+    assert entry["repo"] == _SSH
+    assert entry["metadata"]["imported_from"] == "github:testuser"
+
+
 # ---------------------------------------------------------------------------
 # --prune standalone flag tests
 # ---------------------------------------------------------------------------