deps: move dflash-mlx from optional to required dependency

Author: jundot

omlx/engine/__init__.py

@@ -17,11 +17,7 @@
 from .batched import BatchedEngine
 from .embedding import EmbeddingEngine
 
-# DFlash engine (optional: requires dflash-mlx)
-try:
-    from .dflash import DFlashEngine
-except ImportError:
-    DFlashEngine = None  # type: ignore
+from .dflash import DFlashEngine
 from .reranker import RerankerEngine
 from .stt import STTEngine
 from .sts import STSEngine

pyproject.toml

@@ -64,6 +64,8 @@ dependencies = [
     # mlx-vlm from commit (23e1dff) - Gemma 4 multi-image fix + nested tool parser
     "mlx-vlm @ git+https://github.com/Blaizzy/mlx-vlm@23e1dffd224488141a4f022b6d21d6a730f11507",
     "Pillow>=9.0.0",
+    # dflash-mlx from commit (fc7101b) — block diffusion speculative decoding
+    "dflash-mlx @ git+https://github.com/bstnxbt/dflash-mlx@fc7101b0aa70c60f0754f50a7a10a82c2cdc1a92",
 ]
 
 [project.optional-dependencies]
@@ -77,10 +79,6 @@ mcp = [
 modelscope = [
     "modelscope>=1.10.0",
 ]
-dflash = [
-    # dflash-mlx from commit (fc7101b) — block diffusion speculative decoding
-    "dflash-mlx @ git+https://github.com/bstnxbt/dflash-mlx@fc7101b0aa70c60f0754f50a7a10a82c2cdc1a92",
-]
 audio = [
     # mlx-audio from commit (5175326) with tts/stt/sts extras
     # tts extra: misaki, num2words, spacy, phonemizer-fork, espeakng-loader, sentencepiece