Add shopify store open command

[amcaplan]

WHY are these changes introduced?

Opening a store today means hunting for the right URL. Agents and humans working with stores (especially preview stores, which surface long tokenized access URLs) need a quick, reliable way to jump straight into a storefront without copying URLs around by hand.

This implements the shopify store open design shared in #proj-agentic-store-preview.

WHAT is this pull request doing?

Adds a new shopify store open --store <domain> command that opens a store's storefront in your default browser.

• New command: packages/store/src/cli/commands/store/open.ts
• New service openStore(): packages/store/src/cli/services/store/open.ts
• Registered as store:open in packages/store/src/index.ts

URL resolution goes through the existing getStoreInfo service rather than naively building a URL from the domain string. This matters for preview stores, which expose a tokenized accessUrl that can't be reconstructed from the domain alone. Regular stores resolve to https://<subdomain>. If the browser can't auto-open (e.g. cloud/headless environments), the command prints a clickable URL instead.

How to test your changes?

1. shopify store open --store <your-store>.myshopify.com — opens the storefront.
2. Try with a preview store — confirm it opens the tokenized access URL.
3. In an environment where the browser can't open, confirm a clickable URL is printed.

Unit tests: pnpm exec vitest run packages/store/src/cli/services/store/open.test.ts

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 — added a minor changeset

[amcaplan]

• Add --admin flag to shopify store open #7956
• Add shopify store open command #7955 👈 (View in Graphite)
• main

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[amcaplan]

/snapit

[github-actions]

🫰✨ Thanks @amcaplan! Your snapshot has been published to npm.

Test the snapshot by installing your package globally:

pnpm i -g --@shopify:registry=https://registry.npmjs.org @shopify/cli@0.0.0-snapshot-20260629202701

Caution

After installing, validate the version by running shopify version in your terminal.
If the versions don't match, you might have multiple global instances installed.
Use which shopify to find out which one you are running and uninstall it.