fix: hmr pin; update uv.lock

Also removes now obsolete requirements.* files

Author: tazlin

pyproject.toml

@@ -24,7 +24,7 @@ dependencies = [
     "aiofiles>=24.1.0",
     "aiohttp>=3.11.13",
     "certifi>=2025.1.31",
-    "horde-model-reference>=0.10.0",
+    "horde-model-reference>=2.1.5",
     "logfire>=3.7.1",
     "loguru>=0.7.3",
     "networkx>=3.4.2",