build: Add workspace

[nielsenko]

Setup Dart 3.6 workspace

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[jakemac53]

This one probably shouldn't be a part of the workspace because it has flutter DEPS - I believe it would ultimately require using the flutter SDK to develop all packages in this repo, when most of them only require the Dart SDK.

[nielsenko]

I have removed the counter_app project from the workspace. I left comments behind. Say, if you prefer just to remove it?

[github-actions]

PR Health

Changelog Entry ❗

Package	Changed Files
package:dart_mcp	pkgs/dart_mcp/pubspec.yaml

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[jakemac53]

Afaik we don't need to update the SDK constraint for this, you only need 3.6.0. It is better to keep this version lower to increase compatibility.

Suggested change

	sdk: ^3.9.0
	sdk: ^3.7.0

Same for the other packages please :)

[nielsenko]

Dropped commit: 4fb3fc8 chore: Bump sdk to ^3.9.0

[nielsenko]

However, the workspace won't resolve unless you are on sdk ^3.9.0-163.0.dev, since that is the current lower bound in pkgs/dart_mcp_server/pubspec.yaml.