[v2] Dispatcher/ServerRunner receive-path swap — replaces BaseSession (#2710)

pyproject.toml

@@ -25,7 +25,11 @@ classifiers = [
     "Programming Language :: Python :: 3.14",
 ]
 dependencies = [
-    "anyio>=4.9",
+    # anyio < 4.10 triggers a compile-time SyntaxWarning on Python 3.14 (PEP 765,
+    # "'return' in a 'finally' block"); for stdio servers it lands on the child's
+    # stderr (agronholm/anyio#816, fixed in 4.10).
+    "anyio>=4.10; python_version >= '3.14'",
+    "anyio>=4.9; python_version < '3.14'",
     "httpx>=0.27.1,<1.0.0",
     "httpx-sse>=0.4",
     "pydantic>=2.12.0",
@@ -90,6 +94,7 @@ dev = [
     "pillow>=12.0",
     "strict-no-cover",
     "logfire>=3.0.0",
+    "opentelemetry-sdk>=1.39.1",
 ]
 docs = [
     "mkdocs>=1.6.1",