Issue 56 reproduction

[kentcdodds]

Add execa as a devDependency to all exercise apps to resolve ERR_MODULE_NOT_FOUND when running server/dev-server.js.

The server/dev-server.js files in the exercise apps import execa, but execa was not declared as a dependency in their package.json files. This issue was likely masked in older setups where execa was accidentally available at the root node_modules. With current dependency resolution, execa was only found nested under other packages, making it unresolvable from the playground apps, leading to crashes.

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Note

Low Risk
Dependency-only change (dev-only) with no runtime or business-logic modifications; primary risk is minor lockfile/install churn.

Overview
Fixes local dev crashes in the exercise apps by explicitly adding execa as a devDependency to each exercise package.json, matching what server/dev-server.js already imports.

Updates package-lock.json to include execa@^9.6.1 and its transitive dependencies so installs resolve consistently.

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