Apply upstream 710eb8f531 on the previously integrated c2fc3cf3 snapshot: disable dev ThinLTO and build dev/play dependencies as one codegen unit. Release and ship profiles, MoonWell integration and ruRU localization remain unchanged. Regenerated MAP has no delta.
Verified on Windows: cargo fmt --all -- --check and locked workspace metadata pass; the applied patch matches upstream. Full land gates run before merge. The upstream performance measurements were on macOS; no Windows speedup is claimed. No declared account for live login.
sindoring