Add typed JSON output to Hydrogen environment commands

[gonzaloriestra]

WHY are these changes introduced?

Scripts need environment data and sync receipts without parsing tables, banners or environment variable values.

WHAT is this pull request doing?

Add typed results to env list, env pull and env push. Preserve list fields, empty results, dry runs, cancellation and confirmation behavior. Sync receipts include variable names and metadata without values; dry-run diffs stay out of the JSON result.

Without --json, the existing terminal presentation remains. Example JSON result:

shopify hydrogen env push --env preview --dry-run --json

{"status":"dry-run","file":"/project/.env","variables":["PUBLIC_STORE_DOMAIN"],"skipped":[]}

HOW to test your changes?

pnpm --filter @shopify/cli-hydrogen test src/commands/hydrogen/env/json-output.test.ts

Build and typecheck were checked at each layer. The full stack passed 498 tests (6 skipped), lint, and schema discovery for all 22 finite commands. Command-line smoke checks covered a successful unlink result, fatal project errors, watch-mode rejection and schema environment flags. Live authenticated Shopify operations have not been exercised.

Stack

Draft 5 of 9. Previous: #4098. Next: #4100. One changeset is included in #4103.

1. Prepare Hydrogen commands for typed JSON output
2. Add typed JSON output to Hydrogen build tooling
3. Add typed JSON output to hydrogen customer-account-push
4. Add typed JSON output to hydrogen deploy
5. Add typed JSON output to Hydrogen environment commands
6. Add typed JSON output to Hydrogen route generation
7. Add typed JSON output to Hydrogen project and account commands
8. Add typed JSON output to Hydrogen setup commands
9. Add typed JSON output to Hydrogen maintenance commands

[shopify]

Oxygen deployed a preview of your gonzalo/hydrogen-json-env branch. Details:

Storefront	Status	Preview link	Deployment details	Last update (UTC)
Skeleton (skeleton.hydrogen.shop)	✅ Successful (Logs)	Preview deployment	Inspect deployment	September 29, 2026 2:56 PM

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