Strengthen typed context regression coverage

Author: morluto

docs/handlers/context.md

@@ -14,7 +14,7 @@ Add a parameter annotated with `Context` to any tool:
 
 * The SDK builds a fresh `Context` for every request and passes it in.
 * The parameter **name doesn't matter**. `ctx`, `context`, `c`: the SDK finds it by its annotation.
-* Resources and prompts can declare one too, the same way.
+* URI-template resource handlers and prompt handlers can declare one too, the same way.
 * `ctx.request_id` is the id of the request your function is serving right now.
 
 !!! info
@@ -119,7 +119,7 @@ On a 2026-07-28 connection, clients receive change notifications only on a `subs
 
 ## Recap
 
-* Annotate a parameter with `Context` (in a tool, a resource, or a prompt) and the SDK injects it. The name is yours.
+* Annotate a parameter with `Context` in a tool, resource-template, or prompt handler and the SDK injects it. Static resource handlers cannot accept `Context`. The name is yours.
 * It is invisible to the model: the input schema only ever contains your real arguments.
 * `ctx.request_id` identifies the request; `ctx.request_context.lifespan_context` is what your startup yielded.
 * `await ctx.read_resource(uri)` lets a tool read the server's own resources.

tests/server/mcpserver/resources/test_resource_template.py

@@ -226,12 +226,12 @@ async def test_create_resource_preserves_context_with_variadic_kwargs(self):
         """Injected context bypasses validation without changing **kwargs handling."""
         context = Context()
 
-        def my_func(ctx, **kwargs: str):  # type: ignore
+        def my_func(ctx: Context[None], **kwargs: str) -> str:
             assert ctx is context
             return kwargs["key"]
 
         template = ResourceTemplate.from_function(
-            fn=my_func,  # pyright: ignore[reportUnknownArgumentType]
+            fn=my_func,
             uri_template="test://{key}",
             context_kwarg="ctx",
         )