Add MCP project context switching

[ejsmith]

Summary

• add Redis-backed MCP organization/project context scoped by session, user, OAuth client, and resource
• add MCP context tools for reading and switching active organization/project
• default project-scoped MCP tools to the active project while preserving compatible explicit project ids
• make hosted MCP transport stateful and remove the old GET/DELETE fallback mapping

Testing

• dotnet build
• dotnet test -- --filter-class Exceptionless.Tests.Controllers.ExceptionlessMcpToolsTests
• dotnet test -- --filter-class Exceptionless.Tests.Controllers.OAuthControllerTests
• git diff --check

Breaking changes

None.

[ejsmith]

/preview

[github-actions]

Preview deployed

• App: https://dev-app.exceptionless.io
• Collector: https://dev-collector.exceptionless.io
• Commit: 25b8f2863cf2
• Version: 8.6.1-preview.feature.mcp-project-context.0.12
• Workflow run: view logs

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
Exceptionless.AppHost	39%	40%	134	❌
Exceptionless.Core	71%	63%	8585	➖
Exceptionless.Insulation	24%	23%	203	❌
Exceptionless.Web	75%	63%	5180	➖
Summary	71% (16606 / 23476)	62% (8469 / 13572)	14102	➖