feat: add Stainless SDK config and misc cleanups

[pengying]

Grid API SDK Configuration

• Add .stainless/stainless.yml and workspace.json for SDK generation
• Add AllErrors schema to properly handle error types
• Replace Error schema references with GridError
• Fix phone number format in UltimateBeneficialOwner to include '+' prefix
• Update .redocly.lint-ignore.yaml with additional rule exceptions
• Fix internal_accounts schema reference path

[pengying]

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• feat: add Stainless SDK config and misc cleanups #132 👈 (View in Graphite)
• feat: rename Error to GridError and add additionalProperties to error schemas #131
• feat: add Customer API discriminators and consolidate customer changes #130
• feat: add Quote/Transaction discriminators and remove inline examples #129
• feat: add isPlatformAccount to PaymentInstructions and remove PaymentAccountOrWalletInfo refs #128
• feat: rename accounts to data in list external accounts response #127
• feat: convert single-value enums to const for base types #126
• main

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[greptile-apps]

Greptile Overview

Greptile Summary

This PR adds comprehensive Stainless SDK configuration for TypeScript and Kotlin code generation, along with several OpenAPI schema improvements. The changes introduce a new AllErrors schema that consolidates all error types with proper discriminator support, enabling better SDK error handling. The schema renaming from Error to GridError resolves a naming conflict while maintaining consistency. Additionally, minor fixes include correcting the InternalAccount schema reference path and adding quotes to the phone number example in UltimateBeneficialOwner for proper YAML formatting.

Key changes:

• Added .stainless/stainless.yml with complete resource mappings, authentication config, and error handling setup for SDK generation
• Added .stainless/workspace.json to configure SDK output paths
• Introduced AllErrors union schema for comprehensive error type support with discriminator
• Renamed Error schema to GridError to avoid naming conflicts and added additionalProperties: true to error details
• Fixed internal_accounts.yaml schema reference from users/InternalAccount.yaml to customers/InternalAccount.yaml
• Fixed phone number example formatting in UltimateBeneficialOwner.yaml
• Updated .redocly.lint-ignore.yaml with exceptions for new schemas

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• All changes are configuration and schema improvements that enhance SDK generation capabilities without affecting runtime behavior. The fixes correct invalid schema references and formatting issues. No logic changes or breaking modifications detected.
• No files require special attention

Important Files Changed

Filename	Overview
.stainless/stainless.yml	New comprehensive Stainless SDK configuration for TypeScript and Kotlin targets with complete resource mappings and error handling
.stainless/workspace.json	New workspace configuration file for Stainless SDK generation pointing to OpenAPI spec and TypeScript output directory
openapi/openapi.yaml	Added AllErrors schema union of all error types for SDK generation with proper discriminator support
openapi/paths/customers/customers_{customerId}.yaml	Fixed error response reference from Error.yaml to GridError.yaml for 410 status code
openapi/paths/internal-accounts/internal_accounts.yaml	Corrected InternalAccount schema path from users/InternalAccount.yaml to customers/InternalAccount.yaml

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant Stainless as Stainless SDK Generator
    participant Config as stainless.yml
    participant OpenAPI as OpenAPI Spec
    participant SDK as Generated SDK

    Dev->>Config: Configure SDK targets (TypeScript, Kotlin)
    Dev->>Config: Define resources & error handling
    Dev->>OpenAPI: Add AllErrors union schema
    Dev->>OpenAPI: Rename Error to GridError
    Dev->>OpenAPI: Fix schema references
    
    Stainless->>Config: Read SDK configuration
    Stainless->>OpenAPI: Parse OpenAPI specification
    Stainless->>OpenAPI: Apply transformations (splitSchemasByEnumProperty)
    Note over Stainless,OpenAPI: Split AllErrors by code discriminator
    
    Stainless->>SDK: Generate TypeScript client
    Stainless->>SDK: Generate Kotlin client
    SDK->>SDK: Include typed error classes
    SDK->>SDK: Map resources to SDK methods
    
    Note over SDK: SDK now has proper error types<br/>and correct schema references

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