* Update .NET Copilot SDK cookbook for GitHub.Copilot.SDK 1.0
Align the dotnet copilot-sdk cookbook recipes and docs with the 1.0.1 release:
- Namespace GitHub.Copilot.SDK -> GitHub.Copilot
- MCP config uses Dictionary<string, McpServerConfig> + McpStdioServerConfig (drop Type discriminator)
- StopAsync no longer returns an error list; wrap graceful shutdown in try/catch
- GetMessagesAsync -> GetEventsAsync with event pattern matching
- LogLevel string -> CopilotLogLevel.Error enum
* Address PR review: clarify package/namespace, default event case, MCP stdio wording
- Note that the GitHub.Copilot.SDK package exposes the GitHub.Copilot namespace in each recipe
- Add a default case + note to the GetEventsAsync history example so other event kinds are not silently dropped
- Refine accessibility-report docs to describe a local stdio MCP server (McpStdioServerConfig via npx)
* Address re-review: add using for event types, note StopAsync throw behavior