v2.0.8

• Fix async anti-patterns across all library projects by @rido-min in #402
• feat: SuggestedActionSubmitActivity for suggestedActions/submit invoke by @singhk97 in #464
• address model gaps by @MehakBindra in #472
• Add AI/MCP Client example by @MehakBindra in #486
• A2A Sample by @MehakBindra in #490
• sync main with patches in releases/core by @singhk97 in #505
• Prompt Preview Support (core) follow-up: string overload + JsonContext by @corinagum in #506
• core: add sovereign cloud support via AzureAd configuration by @corinagum in #507
• Bump version to 2.0.8-preview by @corinagum in #512
• Make core packages compliant with Microsoft NuGet authoring requirements by @singhk97 in #513
• Core/activity extensions by @MehakBindra in #515
• Bump ghcr.io/devcontainers/features/docker-in-docker from 2.17.0 to 3.0.0 by @dependabot[bot] in #516
• Security: lock JsonWebToken trust-boundary contract (#6 disposition) by @corinagum in #517
• Improvements to MCP Server Sample by @MehakBindra in #518
• Deprecating Microsoft.Teams.AI and Microsoft.Teams.AI.Models.OpenAI by @MehakBindra in #519
• Update README and icon for core packages by @rido-min in #520
• Simplify dependency management for TeamsBotApplication by @MehakBindra in #521
• feat: deprecate DevTools (Libraries 2.0) in favor of Microsoft 365 Agents Playground by @corinagum in #522
• Update breaking changes doc by @MehakBindra in #523
• Bump qs from 6.15.1 to 6.15.2 in /Samples/Samples.Tab/Web by @dependabot[bot] in #524
• Fix GetLoggerFromServices returning NullLogger during DI setup by @rido-min in #526
• Security hardening: gate DevTools WebSocket behind same-origin check by @corinagum in #527
• feat: SuggestedActionSubmit handler for 2.1 by @singhk97 in #528
• Reject unauthenticated requests when no credentials are configured by @corinagum in #530
• ci: add merge_group trigger to Build & Test & Lint by @corinagum in #531
• Update RELEASE.md by @corinagum in #534
• ci: run Build & Test & Lint on docs-only PRs by @corinagum in #538