CONV-292: Add standard API error contract

[menvil]

Summary

• Adds ApiErrorResponseFactory in app/Support/Api/ with stable {error: {code, message, details}} JSON shape
• Details always an array (never null), status code set explicitly

Test plan

• Factory returns correct shape with all parameters
• Factory defaults to status 400 and empty details
• composer test passes (521 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Implements the standard API error contract (CONV-292) by adding a factory that returns a consistent {error: {code, message, details}} JSON shape. Ensures details is always an array and status codes are set explicitly.

• New Features
  • Added App\Support\Api\ApiErrorResponseFactory with make(code, message, status=400, details=[]) to enforce the contract.
  • Added unit tests for custom responses and defaults (400 status, empty details).

^{Written for commit e13befb. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-292-add-standard-api-error-contract

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