fix: use 1-based runner indices for Gitea Actions compatibility

tests/unit/test_discover_runners.py

@@ -19,13 +19,13 @@ class TestGenerateIndices:
         assert generate_indices(0) == []
 
     def test_one(self) -> None:
-        assert generate_indices(1) == ["0"]
+        assert generate_indices(1) == ["1"]
 
     def test_three(self) -> None:
-        assert generate_indices(3) == ["0", "1", "2"]
+        assert generate_indices(3) == ["1", "2", "3"]
 
     def test_five(self) -> None:
-        assert generate_indices(5) == ["0", "1", "2", "3", "4"]
+        assert generate_indices(5) == ["1", "2", "3", "4", "5"]
 
 
 class TestQueryRunners:
@@ -166,7 +166,7 @@ class TestMain:
         result = runner.invoke(main, [])
         assert result.exit_code == 0
         assert "count=3" in result.output
-        assert 'indices=["0", "1", "2"]' in result.output
+        assert 'indices=["1", "2", "3"]' in result.output
 
     @patch("scripts.ci.discover_runners.get_runner_count", return_value=5)
     def test_count_only(self, mock_count: MagicMock) -> None:
@@ -180,11 +180,11 @@ class TestMain:
         runner = CliRunner()
         result = runner.invoke(main, ["--indices"])
         assert result.exit_code == 0
-        assert json.loads(result.output.strip()) == ["0", "1", "2", "3"]
+        assert json.loads(result.output.strip()) == ["1", "2", "3", "4"]
 
     @patch("scripts.ci.discover_runners.get_runner_count", return_value=1)
     def test_single_runner(self, mock_count: MagicMock) -> None:
         runner = CliRunner()
         result = runner.invoke(main, ["--indices"])
         assert result.exit_code == 0
-        assert json.loads(result.output.strip()) == ["0"]
+        assert json.loads(result.output.strip()) == ["1"]

tests/unit/test_distribute_molecule.py

@@ -184,7 +184,8 @@ class TestCli:
         (root / "alpha").mkdir(parents=True)
         with patch("scripts.ci.distribute_molecule.MOLECULE_ROOT", root):
             runner = CliRunner()
-            result = runner.invoke(cli, ["--runner-index", "0", "--max-runners", "3"])
+            # 1-based index: "1" maps to internal 0
+            result = runner.invoke(cli, ["--runner-index", "1", "--max-runners", "3"])
             assert result.exit_code == 0
             # Output should contain encoded pairs with platform info
             assert "alpha|" in result.output