PERF.68 Server: disk at 75 % with 90 GB reclaimable (a 56 GB Rust build tree, tmp/ build trees, both 0.8 downloads, a lang-overlay cache); logs rotated monthly

Measured: / is 290 of 388 GB. desktop-shell src-tauri target 56 GB (the forks' target moved to W: on 2026-11-08; this one did not; memory rule: never rebuild forks on the VPS), stores/build 18 GB, tmp build trees about 13 GB (editions, public-repos, studio-suite-0.9-a Discord member, devshell, live-apps-www*), downloads 0.8 and 0.8.1 both on disk (2.1 GB each; 0.7 and older moved to the CDN), three byte-identical frozen copies per app (hardlinking would save about 1.3 GB), tmp/cache/lang-overlay 981 MB with no TTL; access.log 345 MB a day uncompressed for a month (2.76 GB now). Noise: mec-broker logs two lines a minute when idle, a Discord member-sandbox-sync logs the same schema drift (team_join_codes.used_at) every 10 minutes, mail-poll logs a PHP array_merge(stdClass) error every 5 minutes (a ContactMail bug). Changes: move or delete the Rust target, clean tmp/ after each release, TTL on lang-overlay, hardlink identical files across frozen versions in bin/release-app.php, publish 0.8 downloads to the CDN like 0.7, weekly (or daily access) logrotate, quiet the idle broker line, fix the sandbox drift and the mail-poll error. About 90 GB back (75 % to about 52 %).