feat: deprecate DevtoolsPlugin in favor of Microsoft 365 Agents Playground

[corinagum]

Summary

• Deprecate DevtoolsPlugin in @microsoft/teams.dev: @deprecated JSDoc on the class, plus a runtime log.warn(...) at onInit time so existing users see the deprecation as soon as they start their bot.
• Add anonymous-mode startup warning in HttpServer.initialize() when no CLIENT_ID / CLIENT_SECRET / TENANT_ID is configured, so customers know their bot accepts unauthenticated requests on /api/messages. 2 new unit tests.
• Remove DevtoolsPlugin from the 11 example bots (echo, a2a, cards, dialogs, lights, message-extensions, quoting, tab, targeted-messages, threading, botbuilder). The @microsoft/teams.dev dependency is dropped from their package.json as well.
• Mirror the removal in the CLI templates (packages/cli/templates/typescript/{echo,tab,graph}) so newly-scaffolded agents stay in sync with the example bots.
• README banner on @microsoft/teams.dev pointing at Microsoft 365 Agents Playground.
• .gitignore: add **/devTools/ so the Playground CLI's local log directory cannot accidentally get committed.

Why

DevTools is being replaced by Microsoft 365 Agents Playground. The replacement is a standalone CLI tool, not a package; customers install it separately and run it alongside their bot. For the grace-period release, DevtoolsPlugin keeps working but loudly signals its deprecation.

The deprecation message wording is stable across SDKs and stays version-agnostic per team convention ("a later version", not a specific version number).

Note for the CI verification check

skip-test-verification

The CLI templates and example bots are usually kept in sync by the verification check, but examples/graph was already DevtoolsPlugin-free on main while packages/cli/templates/typescript/graph still referenced it. This PR aligns the template with the (already correct) example, so the bidirectional-change check sees a one-sided diff. The other two pairs (echo, tab) have matching changes on both sides.

Test plan

• npx turbo build across all packages and examples (green)
• npx jest in packages/apps (270/270 passing, including 2 new tests for the anonymous warning)
• npx turbo lint (clean)
• Started an example bot locally and confirmed the deprecation warning fires
• Captured the anonymous-mode startup warning in the bot console
• npx turbo build --filter=@microsoft/teams.cli after template updates (green)
• Reviewer to spot-check example bots compile and run without DevTools

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR deprecates the legacy @microsoft/teams.dev DevTools experience in favor of Microsoft 365 Agents Playground, while improving runtime visibility when bots start in an unauthenticated/anonymous configuration. It also cleans up the examples to remove DevTools usage and updates repo hygiene to prevent Playground logs from being committed.

Changes:

• Mark DevtoolsPlugin as deprecated (JSDoc + startup warning) and add a deprecation banner to @microsoft/teams.dev README.
• Add a startup warning in HttpServer.initialize() when no credentials are configured, with new unit tests.
• Remove @microsoft/teams.dev / DevtoolsPlugin from multiple examples, update lockfile, and ignore **/devTools/ output.

Reviewed changes

Copilot reviewed 26 out of 28 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/dev/src/plugin.ts	Adds deprecation JSDoc and runtime warning for DevtoolsPlugin.
packages/dev/README.md	Adds a deprecation banner pointing to Microsoft 365 Agents Playground.
packages/apps/src/http/http-server.ts	Warns on initialize when credentials are not configured.
packages/apps/src/http/http-server.spec.ts	Adds tests covering the new anonymous-mode credentials warning behavior.
package-lock.json	Removes @microsoft/teams.dev from example dependency graph and updates lock entries.
examples/threading/src/index.ts	Removes DevtoolsPlugin usage from the example app setup.
examples/threading/package.json	Drops @microsoft/teams.dev dependency.
examples/targeted-messages/src/index.ts	Removes DevtoolsPlugin usage from the example app setup.
examples/targeted-messages/package.json	Drops @microsoft/teams.dev dependency.
examples/tab/src/index.ts	Removes DevtoolsPlugin usage from the example app setup.
examples/tab/package.json	Drops @microsoft/teams.dev dependency.
examples/quoting/src/index.ts	Removes DevtoolsPlugin usage from the example app setup.
examples/quoting/package.json	Drops @microsoft/teams.dev dependency.
examples/message-extensions/src/index.ts	Removes DevtoolsPlugin usage from the example app setup.
examples/message-extensions/package.json	Drops @microsoft/teams.dev dependency.
examples/lights/src/index.ts	Removes DevtoolsPlugin usage from the example app setup.
examples/lights/package.json	Drops @microsoft/teams.dev dependency.
examples/echo/src/index.ts	Removes DevtoolsPlugin usage from the example app setup.
examples/echo/package.json	Drops @microsoft/teams.dev dependency.
examples/dialogs/src/index.ts	Removes DevtoolsPlugin usage from the example app setup.
examples/dialogs/package.json	Drops @microsoft/teams.dev dependency.
examples/cards/src/index.ts	Removes DevtoolsPlugin usage from the example app setup.
examples/cards/package.json	Drops @microsoft/teams.dev dependency.
examples/botbuilder/src/index.ts	Removes DevtoolsPlugin from the plugin list, leaving only BotBuilderPlugin.
examples/botbuilder/package.json	Drops @microsoft/teams.dev dependency.
examples/a2a/src/client-example.ts	Removes DevtoolsPlugin usage from the example app setup.
examples/a2a/package.json	Drops @microsoft/teams.dev dependency.
.gitignore	Ignores Playground-generated devTools/ directories to prevent accidental commits.

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