## [SDK · Network & Horizon] Implement HorizonClient wrapper — accounts endpoint

[amina69]

Epic: Network & Horizon
Labels: network, types, sdk
Size: S (~1 day)

Description

Wrap the Horizon accounts endpoint with error normalisation.

Tasks

• getAccount(accountId): fetch account, return raw AccountRecord
• On 404: throw AccountNotFoundError
• On 400: throw ValidationError("Invalid account ID")
• On 5xx: throw HorizonSubmitError with retryable:true
• On network error/timeout: throw TransactionTimeoutError
• Log request and response at debug level (no secrets)
• Unit test: successful fetch, 404, 400, 500