feat: replace pr_review with spec-driven CI gates and pr-review skill

Add validate_spec, check_pr_size, fast_molecule, nightly_gate, and
create_dependency_pr CI modules. Remove the monolithic pr_review module
and its tests. Replace pr_review CI steps with validate_spec + check_pr_size
+ curl-based APPROVE. Add spec-driven-development and pr-review skills.
Remove dead get_reviewer_token. Update translations and AGENTS.md.

Closes DEVX-155

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

tests/unit/test_cli.py

@@ -107,13 +107,6 @@ class TestCiCommands:
         assert result.exit_code == 0
         mock_run.assert_called_once_with("devx.ci.post_merge", ["DEVX-1"])
 
-    @patch("devx.cli._run_module")
-    def test_ci_pr_review(self, mock_run: MagicMock) -> None:
-        runner = CliRunner()
-        result = runner.invoke(cli, ["ci", "pr-review", "42"])
-        assert result.exit_code == 0
-        mock_run.assert_called_once_with("devx.ci.pr_review", ["42"])
-
     @patch("devx.cli._run_module")
     def test_ci_publish(self, mock_run: MagicMock) -> None:
         runner = CliRunner()