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

Adds Stainless SDK configuration to enable TypeScript and Kotlin SDK generation from the OpenAPI specification, along with several OpenAPI schema improvements.

Key Changes:

• Added .stainless/stainless.yml with comprehensive SDK generation configuration including resource mappings, authentication settings, pagination, and error handling
• Created .stainless/workspace.json to define project structure and output paths
• Added AllErrors union schema that consolidates all error types (Error400-Error501) for proper SDK error handling
• Renamed Error schema to GridError to avoid naming conflicts
• Fixed UltimateBeneficialOwner phone number example to include '+' prefix, matching the E.164 format pattern
• Corrected schema reference path from users/InternalAccount.yaml to customers/InternalAccount.yaml
• Updated .redocly.lint-ignore.yaml with exceptions for the new AllErrors schema and existing Quote schema validation issues

All changes are properly reflected in both the modular OpenAPI files and the bundled openapi.yaml and mintlify/openapi.yaml files.

Confidence Score: 5/5

• This PR is safe to merge with no issues found
• All changes are well-structured configuration and schema improvements. The Stainless SDK config is comprehensive and follows best practices, schema references have been verified to exist, the phone number format fix correctly matches the pattern, and all bundled files are properly synchronized with source files.
• No files require special attention

Important Files Changed

Filename	Overview
.stainless/stainless.yml	Added comprehensive Stainless SDK configuration for TypeScript and Kotlin SDK generation with proper resource mappings and authentication settings
.stainless/workspace.json	Created Stainless workspace config pointing to OpenAPI spec and TypeScript SDK output directory
openapi/openapi.yaml	Added AllErrors union schema to consolidate all error types for SDK generation
openapi/components/schemas/customers/UltimateBeneficialOwner.yaml	Fixed phone number example to include '+' prefix matching E.164 format pattern
openapi/paths/internal-accounts/internal_accounts.yaml	Fixed schema reference path from users/InternalAccount.yaml to customers/InternalAccount.yaml

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant Stainless as Stainless SDK Generator
    participant OpenAPI as OpenAPI Spec
    participant SDK as Generated SDK
    
    Dev->>OpenAPI: Add AllErrors union schema
    Dev->>OpenAPI: Rename Error to GridError
    Dev->>OpenAPI: Fix phone number format
    Dev->>OpenAPI: Fix schema reference paths
    
    Dev->>Stainless: Create stainless.yml config
    Note over Stainless: Define resources, models, methods<br/>Configure authentication<br/>Set error handling
    
    Dev->>Stainless: Create workspace.json
    Note over Stainless: Point to OpenAPI spec<br/>Define output paths
    
    Stainless->>OpenAPI: Read OpenAPI spec
    Stainless->>Stainless: Transform AllErrors using splitSchemasByEnumProperty
    Stainless->>SDK: Generate TypeScript SDK
    Stainless->>SDK: Generate Kotlin SDK
    
    Note over SDK: SDKs now have proper error types,<br/>correct schema references,<br/>and valid examples

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