Stage at most three independent remote GitHub launcher files at once only when the existing effective concurrent-sync capability permits it. Preserve serial fallback, per-file locks and integrity checks, and settle every started upload before failure returns.
Verification: 119 affected tests pass (one existing Linux-only oracle skipped on macOS); full repository typecheck/build pass; same-sandbox real-Daytona component comparison preserves all bytes/modes; current-head full CI/E2E/Superagent/Snyk and Apex 5/5 pass. The full native timing target remains separate and is not claimed by this change.
Co-Authored-By: Paperclip <noreply@paperclip.ing>