docs: add minimal reproduction notebook

pyproject.toml

@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "alpamayo-qwen05b-validation"
 version = "0.1.0"
-description = "Two-stage local Alpamayo validation with a 0.5B Qwen VLM and a KV-conditioned flow-matching expert."
+description = "Minimal NVIDIA Alpamayo reproduction with a Qwen2.5-0.5B VLM and 105.6M diffusion expert."
 readme = "README.md"
 license = "Apache-2.0"
 requires-python = ">=3.12,<3.13"
@@ -35,6 +35,12 @@ dev = [
   "pytest>=8.3",
   "ruff>=0.9",
 ]
+notebook = [
+  "ipykernel>=6.29",
+  "jupyterlab>=4.4",
+  "nbclient>=0.10",
+  "nbformat>=5.10",
+]
 
 [tool.setuptools.packages.find]
 where = ["src"]