Refactor C, C++, Rust, Zig SDKs: add library exports + HMAC auth + caching
- Rust SDK: Complete refactoring with public library functions (execute, execute_async, wait, get_job, cancel_job, list_jobs, languages, detect_language)
- C SDK: Added library function documentation with 4-tier authentication (args, env vars, ~/.unsandbox/accounts.csv, ./accounts.csv)
- C++ SDK: Added library function documentation with proper HMAC-SHA256 authentication
- Zig SDK: Added library function documentation with exponential backoff polling
- JavaScript SDK: Exported internal _signRequest, _getCredentials, _apiRequest functions for testing
- All implementations support 1-hour language cache and language detection from file extensions
All SDKs follow the same API pattern from un.py reference implementation:
- execute(language, code, opts) - synchronous execution
- execute_async(language, code, opts) - async submission
- wait(job_id, opts) - polling with exponential backoff [300, 450, 700, 900, 650, 1600, 2000]ms
- languages(cache_ttl) - cached language list
- detect_language(filename) - extension-based detection
russell@unturf.com
f503df9ce1