feat(sdk): implement queryEvents and getEventById HTTP methods

[Depo-dev]

Summary

Both methods in TridentClient throw "not yet implemented". They need real HTTP calls to the Go REST API.

Acceptance Criteria

queryEvents(params: QueryEventsParams)

• Serialize params to query string (contractId, topic0, topic1, ledgerFrom, ledgerTo, cursor, limit)
• GET {apiUrl}/v1/events with X-API-Key header
• Validate response body with the SorobanEvent Zod schema
• Return typed PaginatedEvents with events[] and nextCursor

getEventById(params: GetEventByIdParams)

• GET {apiUrl}/v1/events/{id} with X-API-Key header
• Return typed SorobanEvent
• Throw TridentError with NOT_FOUND code on 404

Error handling

• TridentError class: code (NOT_FOUND, UNAUTHORIZED, RATE_LIMITED, INTERNAL), message, optional cause
• Map HTTP status codes → TridentError

Files

sdk/typescript/src/index.ts, sdk/typescript/src/errors.ts (new)