[Nitro] Serialize McpAppViewVisibility as camelCase strings

[glen-84]

No description provided.

[Copilot]

Pull request overview

This PR updates the Nitro MCP tool settings JSON serialization so McpAppViewVisibility values are emitted as camelCase strings (e.g., "model", "app") when using the source-generated System.Text.Json context, and adds tests to validate parsing/formatting/round-tripping behavior.

Changes:

• Register a System.Text.Json enum converter in McpSettingsSerializerContext to serialize McpAppViewVisibility as camelCase strings.
• Add snapshot-based tests covering McpToolSettingsSerializer parse/format behavior, including visibility.
• Change McpToolSettingsPermissions from a class to a sealed record.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/Nitro/Common/test/ChilliCream.Nitro.Adapters.Mcp.Tests/Serialization/McpToolSettingsSerializerTests.cs	Adds comprehensive parse/format/round-trip tests, including snapshot expectations for camelCase JSON and visibility serialization.
src/Nitro/Common/src/ChilliCream.Nitro.Adapters.Mcp/Serialization/McpToolSettings.cs	Adjusts McpToolSettingsPermissions type definition (class → sealed record).
src/Nitro/Common/src/ChilliCream.Nitro.Adapters.Mcp/Serialization/McpSettingsSerializerContext.cs	Registers a custom enum converter in the source-gen context to camelCase McpAppViewVisibility values.

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