fix(cli): route --verbose tracebacks to stderr too

The generic --verbose handlers in scan() and baseline() still called
console.print_exception(), so a fatal traceback landed on stdout while
stderr stayed empty — the exact split the rest of this PR fixes for the
one-line error messages. A caller redirecting stdout to a report file got
the traceback inside the file and nothing in its error log.

Both branches now print through err_console, and the regression asserts
the separation on both commands: RuntimeError appears in stderr and not
in stdout, exit code 2.

Tests: tests/unit 735 passed, 12 skipped.
Signed-off-by: Mark2Mac <Mark2Mac@users.noreply.github.com>

Author: Mark2Mac

src/skillspector/cli.py

@@ -386,7 +386,7 @@ def scan(
         raise typer.Exit(code=2) from e
     except Exception as e:
         if verbose:
-            console.print_exception()
+            err_console.print_exception()
         else:
             err_console.print(f"[red]Error:[/red] {e}")
         raise typer.Exit(code=2) from e
@@ -639,7 +639,7 @@ def baseline(
         raise typer.Exit(code=2) from e
     except Exception as e:
         if verbose:
-            console.print_exception()
+            err_console.print_exception()
         else:
             err_console.print(f"[red]Error:[/red] {e}")
         raise typer.Exit(code=2) from e

tests/unit/test_cli.py

@@ -756,3 +756,30 @@ def fake_invoke(state: dict[str, Any], config: Any = None) -> dict[str, Any]:
     assert payload["issues"] == [{"id": "X-1", "severity": "low"}]
     assert payload["suppressed_count"] == 0
     assert payload["suppressed"] == []
+
+
+def test_scan_verbose_traceback_goes_to_stderr(tmp_path: Path) -> None:
+    """A fatal --verbose traceback belongs on stderr, so stdout stays parseable."""
+    (tmp_path / "SKILL.md").write_text("# Boom", encoding="utf-8")
+
+    with patch("skillspector.cli.graph.invoke", side_effect=RuntimeError("scan crashed")):
+        result = runner.invoke(app, ["scan", str(tmp_path), "--no-llm", "--verbose"])
+
+    assert result.exit_code == 2
+    assert "RuntimeError" in result.stderr
+    assert "RuntimeError" not in result.stdout
+
+
+def test_baseline_verbose_traceback_goes_to_stderr(tmp_path: Path) -> None:
+    """Same separation for `baseline`, which shares the generic --verbose handler."""
+    (tmp_path / "SKILL.md").write_text("# Boom", encoding="utf-8")
+
+    with patch("skillspector.cli.graph.invoke", side_effect=RuntimeError("baseline crashed")):
+        result = runner.invoke(
+            app,
+            ["baseline", str(tmp_path), "--no-llm", "--verbose", "-o", str(tmp_path / "b.yaml")],
+        )
+
+    assert result.exit_code == 2
+    assert "RuntimeError" in result.stderr
+    assert "RuntimeError" not in result.stdout