fix: resolve CI failures on macOS — speculative decoding flag collision + missing fastapi

- Rename --spec-tokens to --num-speculative-tokens to avoid prefix
  collision with --speculative-decoding in Typer help rendering
- Add pytest.skip for _create_app tests when fastapi is not installed

soup_cli/commands/serve.py

@@ -69,12 +69,11 @@ def serve(
     speculative_model: Optional[str] = typer.Option(
         None,
         "--speculative-decoding",
-        "--spec-dec",
         help="Draft model for speculative decoding (smaller/faster model ID or path)",
     ),
     num_speculative_tokens: int = typer.Option(
         5,
-        "--spec-tokens",
+        "--num-speculative-tokens",
         help="Number of tokens the draft model generates per step (speculative decoding)",
     ),
 ):

tests/test_speculative_decoding.py

@@ -23,7 +23,7 @@ class TestSpeculativeDecodingCLI:
         assert "--speculative-decoding" in result.output
 
     def test_serve_spec_tokens_flag_exists(self):
-        """The serve command should accept --spec-tokens flag."""
+        """The serve command should accept --num-speculative-tokens flag."""
         from typer.testing import CliRunner
 
         from soup_cli.cli import app
@@ -31,7 +31,7 @@ class TestSpeculativeDecodingCLI:
         runner = CliRunner()
         result = runner.invoke(app, ["serve", "--help"])
         assert result.exit_code == 0
-        assert "--spec-tokens" in result.output
+        assert "--num-speculative-tokens" in result.output
 
 
 # ─── Draft Model Loading Tests ────────────────────────────────────────────
@@ -200,6 +200,11 @@ class TestCreateAppWithDraftModel:
 
     def test_create_app_accepts_draft_model(self):
         """_create_app should accept draft_model parameter."""
+        try:
+            import fastapi  # noqa: F401
+        except ImportError:
+            pytest.skip("FastAPI not installed")
+
         mock_model = MagicMock()
         mock_tokenizer = MagicMock()
         mock_draft = MagicMock()
@@ -219,6 +224,11 @@ class TestCreateAppWithDraftModel:
 
     def test_create_app_without_draft_model(self):
         """_create_app should work without draft_model."""
+        try:
+            import fastapi  # noqa: F401
+        except ImportError:
+            pytest.skip("FastAPI not installed")
+
         mock_model = MagicMock()
         mock_tokenizer = MagicMock()