feat: add project config and test scaffolding

tests/test_config.py

@@ -0,0 +1,28 @@
+from server.config import config, EscalationConfig, ModelConfig, AppConfig
+
+
+def test_config_defaults():
+    """Config loads with sane defaults."""
+    assert config.port == 8400
+    assert config.host == "0.0.0.0"
+    assert config.device == "cuda"
+
+
+def test_escalation_defaults():
+    """Escalation config has correct default rate and timing."""
+    assert config.escalation.rate == 0.05
+    assert config.escalation.initial_batch_size == 40
+    assert config.escalation.max_images == 200
+    assert config.escalation.max_audio_clips == 50
+
+
+def test_model_defaults():
+    """Model config points to correct model IDs."""
+    assert "sdxl-turbo" in config.models.sdxl_model_id
+    assert "xtts" in config.models.xtts_model
+
+
+def test_timing_defaults():
+    """Timing ranges are ordered correctly."""
+    assert config.escalation.asset_swap_min < config.escalation.asset_swap_max
+    assert config.escalation.voice_mean_interval > 0