Add/enforce --json and output boundary for store commands

[dmerand]

What

Add --json to shopify store auth and shopify store execute.

This makes the final command contract object-first: the structured result is canonical, and human-readable output is derived from that same result.

Why

shopify store * commands are intended to work well for agents and scripts as well as humans.

The lower PRs make the auth and execute domain boundaries clearer, but the top-of-stack command contract still needed a JSON path for final results. This PR adds that path without changing the default human-readable behavior.

How

• add --json to shopify store auth
• add --json to shopify store execute
• make authenticateStoreWithApp(...) return a structured auth result and route final display through an auth presenter
• keep browser/manual-auth guidance on stderr while writing JSON auth results to stdout
• make executeStoreOperation(...) return the GraphQL result instead of owning final output
• move execute output/file-writing back to the command boundary via writeOrOutputStoreExecuteResult(...)
• remove outputFile from the prepared execute request so request parsing stays separate from output policy

High-level flow after this PR:

sequenceDiagram
    participant Command
    participant Service
    participant Result as Canonical result
    participant Renderer as Text/JSON renderer
    participant Stdout
    participant Stderr

    Command->>Service: run operation
    Service-->>Command: structured result
    Command->>Renderer: render(result, format)
    alt format = json
        Renderer->>Stdout: final structured result
    else format = text
        Renderer->>Stderr: human-readable summary
    end

Loading

Out of scope here:

• shopify store auth info
• shopify store auth logout

Those commands are still experimental and are intentionally left out of this PR.

Testing

Manual checks:

pnpm run shopify store auth --store donaldmerand.myshopify.com --scopes read_products --json
pnpm run shopify store execute --store donaldmerand.myshopify.com --query 'query { shop { name id } }' --json
pnpm run shopify store auth --help
pnpm run shopify store execute --help

Verify that:

• --json is listed in help for both commands
• store auth --json prints only the final auth result to stdout
• browser/manual-auth guidance still goes to stderr
• store execute --json prints only the GraphQL result to stdout
• --output-file still writes the JSON result without a human success banner in JSON mode

Considered

• Reuse the older dlm-store-json shape directly: rejected; this PR is rebuilt on top of the cleaned auth/execute seams.
• Broaden this PR to include store auth info/logout: out of scope while those commands are still experimental.
• Keep final output ownership inside execute service flow: rejected in favor of command/output-seam ownership.

Measuring impact

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes

[dmerand]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Add/enforce --json and output boundary for store commands #7190 👈 (View in Graphite)
• Store execute restructure #7188
• Store auth restructure #7187
• Make store auth scopes additive #7172 : 1 other dependent PR (#7184 )
• main

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[github-actions]

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