.NET: [BREAKING] Migrate .NET GitHub Copilot SDK to v1.0.0

[giles17]

Summary

Upgrades the .NET Microsoft.Agents.AI.GitHub.Copilot package from GitHub.Copilot.SDK 1.0.0-beta.2 to stable 1.0.0.

Companion to the Python migration in #6292.

Breaking API Migrations

Change	Before	After
Namespace	GitHub.Copilot.SDK	GitHub.Copilot / GitHub.Copilot.Rpc
Permission handler return	PermissionRequestResult	PermissionDecision
Permission result	PermissionRequestResultKind.Approved	PermissionDecision.ApproveOnce()
Client options	AutoStart = false	Removed (client never auto-starts)
Client state check	client.State != ConnectionState.Connected	StartAsync() is idempotent
Config directory	SessionConfig.ConfigDir	SessionConfig.ConfigDirectory
Tools type	ICollection<AIFunction>	ICollection<AIFunctionDeclaration>
Attachment type	UserMessageAttachmentFile	AttachmentFile
Cache write tokens	double?	long?
Duration	double? (milliseconds)	TimeSpan?
Event subscription	session.On(evt => ...)	session.On<SessionEvent>(evt => ...)

Improvements

• CopySessionConfig now uses SessionConfig.Clone() — automatically forwards all new properties added in v1.0.0
• Added GHCP001 NoWarn at project level (follows framework convention for upstream experimental APIs, same as MEAI001/OPENAI001 elsewhere)

Files Modified (12)

• Directory.Packages.props — version bump
• GitHubCopilotAgent.cs — core API updates
• CopilotClientExtensions.cs — namespace
• Microsoft.Agents.AI.GitHub.Copilot.csproj — NoWarn
• Unit tests (3 files) — namespace, types, NoWarn
• Integration tests (2 files) — namespace, permission types, NoWarn
• Sample Program.cs, README.md, .csproj — namespace, permission API, NoWarn

Testing

• All 15 unit tests pass
• Build clean across net8.0, net9.0, net10.0

[Copilot]

Pull request overview

This PR updates the .NET integration package (Microsoft.Agents.AI.GitHub.Copilot) to work with the stable GitHub.Copilot.SDK v1.0.0, adapting to the GA namespace and API breaking changes while keeping agent behavior consistent with the framework.

Changes:

• Bumps GitHub.Copilot.SDK from 1.0.0-beta.2 to 1.0.0 and migrates code to the new namespaces (GitHub.Copilot + GitHub.Copilot.Rpc).
• Updates agent/session glue code for SDK changes (idempotent StartAsync, typed On<SessionEvent>, attachment + tool declaration type updates, config clone usage).
• Adds GHCP001 to NoWarn across the library, tests, and sample project to align with upstream/experimental warning-handling conventions.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
dotnet/Directory.Packages.props	Bumps GitHub.Copilot.SDK dependency to 1.0.0.
dotnet/src/Microsoft.Agents.AI.GitHub.Copilot/Microsoft.Agents.AI.GitHub.Copilot.csproj	Adds GHCP001 suppression at the library project level.
dotnet/src/Microsoft.Agents.AI.GitHub.Copilot/GitHubCopilotAgent.cs	Migrates core agent implementation to GA SDK APIs (session events, start semantics, config cloning, attachments, usage types).
dotnet/src/Microsoft.Agents.AI.GitHub.Copilot/CopilotClientExtensions.cs	Moves extension namespace to GitHub.Copilot to match the GA SDK surface.
dotnet/tests/Microsoft.Agents.AI.GitHub.Copilot.UnitTests/Microsoft.Agents.AI.GitHub.Copilot.UnitTests.csproj	Adds GHCP001 suppression for unit test project.
dotnet/tests/Microsoft.Agents.AI.GitHub.Copilot.UnitTests/GitHubCopilotAgentTests.cs	Updates unit tests for renamed types and config properties in v1.0.0.
dotnet/tests/Microsoft.Agents.AI.GitHub.Copilot.UnitTests/CopilotClientExtensionsTests.cs	Updates extension tests for new namespaces / options behavior.
dotnet/tests/Microsoft.Agents.AI.GitHub.Copilot.IntegrationTests/Microsoft.Agents.AI.GitHub.Copilot.IntegrationTests.csproj	Adds GHCP001 suppression for integration test project.
dotnet/tests/Microsoft.Agents.AI.GitHub.Copilot.IntegrationTests/GitHubCopilotAgentTests.cs	Updates integration tests to use PermissionDecision API.
dotnet/samples/02-agents/AgentProviders/Agent_With_GitHubCopilot/README.md	Updates sample docs to the GA namespaces.
dotnet/samples/02-agents/AgentProviders/Agent_With_GitHubCopilot/Program.cs	Updates sample permission handler to PermissionDecision API and GA namespaces.
dotnet/samples/02-agents/AgentProviders/Agent_With_GitHubCopilot/Agent_With_GitHubCopilot.csproj	Adds GHCP001 suppression for the sample project.

[github-actions]

Automated Code Review

Reviewers: 5 | Confidence: 87% | Result: All clear

Reviewed: Correctness, Security Reliability, Test Coverage, Failure Modes, Design Approach

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Automated review by giles17's agents