Create comprehensive SDK packages for JavaScript, Python, and Go

[Smartdevs17]

Description

SDK packages exist in early form but lack full API coverage and documentation. Complete SDK implementation across all target languages.

Acceptance Criteria

• JavaScript SDK with full API coverage
• Python SDK with type hints
• Go SDK with idiomatic patterns
• SDK tests for each language
• Auto-generation from OpenAPI spec
• Package publication pipeline

Technical Scope

• sdks/javascript/
• sdks/python/
• sdks/go/
• docs/openapi.yaml
• Edge: language-specific error handling patterns, async vs sync API design