feat(release): auto-run publish after release with --no-publish opt-out

- Run publish automatically after successful release
- Add --no-publish flag to disable auto-publish
- Respect TTY for interactive/credential prompts
- Harden repo directory resolution
- Add integration and unit tests for release→publish hook

https://chatgpt.com/share/693f335b-b820-800f-8666-68355f3c938f

tests/integration/test_release_publish_hook.py

@@ -0,0 +1,66 @@
+from __future__ import annotations
+
+import tempfile
+import unittest
+from types import SimpleNamespace
+from unittest.mock import patch
+
+
+class TestIntegrationReleasePublishHook(unittest.TestCase):
+    def _ctx(self) -> SimpleNamespace:
+        # Minimal CLIContext shape used by handle_release()
+        return SimpleNamespace(
+            repositories_base_dir="/tmp",
+            all_repositories=[],
+        )
+
+    def _parse(self, argv: list[str]):
+        from pkgmgr.cli.parser import create_parser
+
+        parser = create_parser("pkgmgr test")
+        return parser.parse_args(argv)
+
+    def test_release_runs_publish_by_default_and_respects_tty(self) -> None:
+        from pkgmgr.cli.commands.release import handle_release
+
+        with tempfile.TemporaryDirectory() as td:
+            selected = [{"directory": td}]
+
+            # Go through real parser to ensure CLI surface is wired correctly
+            args = self._parse(["release", "patch"])
+
+            with patch("pkgmgr.cli.commands.release.run_release") as m_release, patch(
+                "pkgmgr.cli.commands.release.run_publish"
+            ) as m_publish, patch(
+                "pkgmgr.cli.commands.release.sys.stdin.isatty", return_value=False
+            ):
+                handle_release(args=args, ctx=self._ctx(), selected=selected)
+
+            m_release.assert_called_once()
+            m_publish.assert_called_once()
+
+            _, kwargs = m_publish.call_args
+            self.assertEqual(kwargs["repo"], selected[0])
+            self.assertEqual(kwargs["repo_dir"], td)
+            self.assertFalse(kwargs["interactive"])
+            self.assertFalse(kwargs["allow_prompt"])
+
+    def test_release_skips_publish_when_no_publish_flag_set(self) -> None:
+        from pkgmgr.cli.commands.release import handle_release
+
+        with tempfile.TemporaryDirectory() as td:
+            selected = [{"directory": td}]
+
+            args = self._parse(["release", "patch", "--no-publish"])
+
+            with patch("pkgmgr.cli.commands.release.run_release") as m_release, patch(
+                "pkgmgr.cli.commands.release.run_publish"
+            ) as m_publish:
+                handle_release(args=args, ctx=self._ctx(), selected=selected)
+
+            m_release.assert_called_once()
+            m_publish.assert_not_called()
+
+
+if __name__ == "__main__":
+    unittest.main()