Add missing exception documentation for public APIs

[Copilot]

Adds missing <exception cref="McpException"> XML documentation to public methods that call SendRequestAsync or SendNotificationAsync but were not documenting the exception. All other public methods in both files already correctly document this exception — these were all task-related methods that were likely added together and missed the pattern.

Methods fixed in McpClient.Methods.cs

• GetTaskResultAsync
• GetTaskAsync
• ListTasksAsync (both the convenience and raw ListTasksRequestParams overloads)
• CancelTaskAsync

Methods fixed in McpServer.Methods.cs

• NotifyTaskStatusAsync

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[stephentoub]

@copilot is this really the only missing exception comment? Please search for others.

[Copilot]

@copilot is this really the only missing exception comment? Please search for others.

Found 4 more missing McpException docs (in addition to the one already fixed). All are task-related methods that were added together and missed the pattern. Fixed in faab35e:

• McpClient.GetTaskAsync — calls SendRequestAsync
• McpClient.ListTasksAsync (both overloads) — calls SendRequestAsync
• McpClient.CancelTaskAsync — calls SendRequestAsync
• McpServer.NotifyTaskStatusAsync — calls SendNotificationAsync

All other public methods in both files already had the documentation.