test: add CLI --help smoke tests for every command

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_cli.py

@@ -0,0 +1,24 @@
+from click.testing import CliRunner
+
+from smileyface.cli import cli
+
+
+def test_root_help():
+    result = CliRunner().invoke(cli, ["--help"])
+    assert result.exit_code == 0, result.output
+    assert "SmileyFace" in result.output
+
+
+def test_every_command_help():
+    runner = CliRunner()
+    for name in cli.commands:
+        result = runner.invoke(cli, [name, "--help"])
+        assert result.exit_code == 0, f"`{name} --help` failed:\n{result.output}"
+
+
+def test_scrape_subcommands_help():
+    runner = CliRunner()
+    scrape_group = cli.commands["scrape"]
+    for name in scrape_group.commands:
+        result = runner.invoke(cli, ["scrape", name, "--help"])
+        assert result.exit_code == 0, f"`scrape {name} --help` failed:\n{result.output}"