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chore: Update SDK documentation (#2834)

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Co-authored-by: marvin-context-protocol[bot] <225465937+marvin-context-protocol[bot]@users.noreply.github.com>
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docs/python-sdk/fastmcp-server-low_level.mdx
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@ -43,7 +43,20 @@ Get the FastMCP instance.
create_initialization_options(self, notification_options: NotificationOptions | None = None, experimental_capabilities: dict[str, dict[str, Any]] | None = None, **kwargs: Any) -> InitializationOptions
```
#### `run` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/low_level.py#L168" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
#### `get_capabilities` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/low_level.py#L168" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
get_capabilities(self, notification_options: NotificationOptions, experimental_capabilities: dict[str, dict[str, Any]]) -> mcp.types.ServerCapabilities
```
Override to set capabilities.tasks as a first-class field per SEP-1686.
This ensures task capabilities appear in capabilities.tasks instead of
capabilities.experimental.tasks, which is required by the MCP spec and
enables proper task detection by clients like VS Code Copilot 1.107+.
#### `run` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/low_level.py#L193" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
run(self, read_stream: MemoryObjectReceiveStream[SessionMessage | Exception], write_stream: MemoryObjectSendStream[SessionMessage], initialization_options: InitializationOptions, raise_exceptions: bool = False, stateless: bool = False)
@ -52,7 +65,7 @@ run(self, read_stream: MemoryObjectReceiveStream[SessionMessage | Exception], wr
Overrides the run method to use the MiddlewareServerSession.
#### `read_resource` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/low_level.py#L204" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
#### `read_resource` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/low_level.py#L229" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
read_resource(self) -> Callable[[Callable[[AnyUrl], Awaitable[mcp.types.ReadResourceResult | mcp.types.CreateTaskResult]]], Callable[[AnyUrl], Awaitable[mcp.types.ReadResourceResult | mcp.types.CreateTaskResult]]]
@ -67,7 +80,7 @@ This decorator can be removed once the MCP SDK adds native CreateTaskResult supp
for resources.
#### `get_prompt` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/low_level.py#L248" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
#### `get_prompt` <sup><a href="https://github.com/jlowin/fastmcp/blob/main/src/fastmcp/server/low_level.py#L273" target="_blank"><Icon icon="github" style="width: 14px; height: 14px;" /></a></sup>
```python
get_prompt(self) -> Callable[[Callable[[str, dict[str, Any] | None], Awaitable[mcp.types.GetPromptResult | mcp.types.CreateTaskResult]]], Callable[[str, dict[str, Any] | None], Awaitable[mcp.types.GetPromptResult | mcp.types.CreateTaskResult]]]