[Performance] Memoize isShopify

[gonzaloriestra]

WHY are these changes introduced?

The isShopify function performs a disk check to see if the dev executable is present. This function is called multiple times during the CLI lifecycle, including for every analytics event. Memoizing the result avoids redundant disk I/O, which can measurably reduce the execution time of commands, especially when multiple analytics events are triggered.

WHAT is this pull request doing?

• Memoizes the result of isShopify when called with the default process.env.
• Uses a module-level promise to ensure that concurrent calls await the same operation.
• Exposes an internal _resetIsShopify function to maintain test isolation.
• Adds a unit test to verify that the file system check is only performed once.

How to test your changes?

CI

Post-release steps

N/A

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 8086827328400609332 started by @gonzaloriestra

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[github-actions]

Differences in type declarations

We detected differences in the type declarations generated by Typescript for this branch compared to the baseline ('main' branch). Please, review them to ensure they are backward-compatible. Here are some important things to keep in mind:

• Some seemingly private modules might be re-exported through public modules.
• If the branch is behind main you might see odd diffs, rebase main into this branch.

New type declarations

We found no new type declarations in this PR

Existing type declarations

packages/cli-kit/dist/public/node/context/local.d.ts

@@ -173,4 +173,8 @@ export declare function getThemeKitAccessDomain(env?: NodeJS.ProcessEnv): string
  * @returns The domain to send OTEL metrics to.
  */
 export declare function opentelemetryDomain(env?: NodeJS.ProcessEnv): string;
+/**
+ * Resets the memoized value for the shopify check.
+ */
+export declare function _resetIsShopify(): void;
 export type CIMetadata = Metadata;
\ No newline at end of file