Tighten version floors: transformers >=5.0, huggingface-hub >=1.0, Python >=3.10

- transformers: 4.x line is dead, 5.x stable since late 2025, CI uses 5.3.0
- huggingface-hub: jumped to 1.x major version, 0.x is obsolete
- requires-python: 3.9 hit EOL October 2025, raises FastAPI compat issues
- ruff target-version: updated to py310 to match
- Added Python 3.10/3.11/3.12 classifiers

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: SStas

pyproject.toml

@@ -8,13 +8,16 @@ dynamic = ["version"]
 description = "Multi-agent text handoffs discard KV-cache and attention state. AVP transfers that state directly — 51-78% fewer tokens, 1.5-5x faster."
 readme = "README.md"
 license = "Apache-2.0"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 authors = [{ name = "VectorArc" }]
 classifiers = [
     "Development Status :: 3 - Alpha",
     "Intended Audience :: Developers",
     "License :: OSI Approved :: Apache Software License",
     "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Topic :: Scientific/Engineering :: Artificial Intelligence",
 ]
 
@@ -33,9 +36,9 @@ Changelog = "https://github.com/VectorArc/avp-python/blob/main/CHANGELOG.md"
 
 [project.optional-dependencies]
 # Engine connectors (pick one or more)
-hf = ["torch>=2.0", "transformers>=4.36"]
+hf = ["torch>=2.0", "transformers>=5.0"]
 huggingface = ["avp[hf]"]
-vllm = ["vllm>=0.17.0,<0.19.0", "safetensors>=0.4", "huggingface-hub>=0.20"]
+vllm = ["vllm>=0.17.0,<0.19.0", "safetensors>=0.4", "huggingface-hub>=1.0"]
 llamacpp = ["llama-cpp-python>=0.3", "gguf>=0.6"]
 ollama = ["llama-cpp-python>=0.3", "gguf>=0.6"]
 # Framework integrations (each requires HF engine)
@@ -78,4 +81,4 @@ addopts = "-m 'not requires_vllm'"
 
 [tool.ruff]
 line-length = 99
-target-version = "py39"
+target-version = "py310"