Migrate Device Registry tools to new tool design

[alzimmermsft]

What does this PR do?

Migrates Device Registry tools to new design where Register and Bind options are based on Option attributes.

GitHub issue number?

[Link to the GitHub issue this PR addresses]

Pre-merge Checklist

• Required for All PRs
  • Read contribution guidelines
  • PR title clearly describes the change
  • Commit history is clean with descriptive messages (cleanup guide)
  • Added comprehensive tests for new/modified functionality
  • Created a changelog entry if the change falls among the following: new feature, bug fix, UI/UX update, breaking change, or updated dependencies. Follow the changelog entry guide
• For MCP tool changes:
  • One tool per PR: This PR adds or modifies only one MCP tool for faster review cycles
  • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
  • Validate README.md changes running the script ./eng/scripts/Process-PackageReadMe.ps1. See Package README
  • For new or modified tool descriptions, ran ToolDescriptionEvaluator and obtained a score of 0.4 or more and a top 3 ranking for all related test prompts
  • For tools with new names, including new tools or renamed tools, update consolidated-tools.json
  • For renamed tools, follow the Tool Rename Checklist and tag the PR with the breaking-change label
  • For new tools associated with Azure services or publicly available tools/APIs/products, add URL to documentation in the PR description
• Extra steps for Azure MCP Server tool changes:
  • Updated command list in servers/Azure.Mcp.Server/docs/azmcp-commands.md
  • Ran ./eng/scripts/Update-AzCommandsMetadata.ps1 to update tool metadata in azmcp-commands.md (required for CI)
  • Updated test prompts in servers/Azure.Mcp.Server/docs/e2eTestPrompts.md
  • 👉 For Community (non-Microsoft team member) PRs:
    • Security review: Reviewed code for security vulnerabilities, malicious code, or suspicious activities before running tests (crypto mining, spam, data exfiltration, etc.)
    • Manual tests run: added comment /azp run mcp - pullrequest - live to run Live Test Pipeline

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[Copilot]

Pull request overview

Migrates the Azure.Mcp.Tools.DeviceRegistry toolset to the newer command/options pattern where CLI options are derived from [Option] / [OptionContainer] attributes, removing the legacy RegisterOptions / BindOptions and System.CommandLine dependency.

Changes:

• Converted NamespaceListCommand to the two-generic SubscriptionCommand<TOptions, TResult> pattern and switched options binding to [Option] attributes.
• Simplified Device Registry service/model JSON (property naming + source-gen context usage) and removed legacy option/command scaffolding (*OptionDefinitions, Base*Command, System.CommandLine global using).
• Updated unit tests to use SubscriptionCommandUnitTestsBase for the new command shape.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tools/Azure.Mcp.Tools.DeviceRegistry/tests/Azure.Mcp.Tools.DeviceRegistry.Tests/Namespace/NamespaceListCommandTests.cs	Updates command test base class/imports to align with the new subscription command pattern.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Services/Models/DeviceRegistryNamespaceData.cs	Renames JSON-mapped properties and simplifies FromJson deserialization via source-gen context.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Services/DeviceRegistryService.cs	Removes logger/try-catch wrapper; keeps a direct ExecuteResourceQueryAsync call and updated model mapping.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Options/Namespace/NamespaceListOptions.cs	Replaces legacy base options with a flat [Option]-based options POCO.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Options/DeviceRegistryOptionDefinitions.cs	Removes legacy System.CommandLine option definition for namespace.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Options/BaseDeviceRegistryOptions.cs	Removes legacy base options class inheriting SubscriptionOptions.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Models/DeviceRegistryNamespaceInfo.cs	Removes explicit JsonPropertyName attributes from the public response model.
tools/Azure.Mcp.Tools.DeviceRegistry/src/GlobalUsings.cs	Removes System.CommandLine global using.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Commands/Namespace/NamespaceListCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> with attribute-bound options and source-gen response serialization.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Commands/DeviceRegistryJsonContext.cs	Simplifies the source-gen context declaration and ensures result/model types are registered.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Commands/BaseDeviceRegistryCommand.cs	Removes legacy subscription command base class.
tools/Azure.Mcp.Tools.DeviceRegistry/src/Azure.Mcp.Tools.DeviceRegistry.csproj	Drops System.CommandLine package reference and adjusts the core project reference.
servers/Azure.Mcp.Server/changelog-entries/1784321301060.yaml	Adds a changelog entry for the Device Registry toolset change.