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Releases now ship as often as changes land, so nothing they leave behind may grow without bound. Workflow uploads keep 3 days (nightly parity logs 7); the releases carry their own assets. tools/ci/runner-gc.sh, run every 6 hours by launchd on the Mac mini from a copy of main, skips a runner in a job, removes a checkout's cargo build folders past 12 GB and harness work folders under .local/ untouched for 3 days, and keeps the 2 newest shared preparations while no runner works. The runners build through the machine's sccache, so what it removes comes back from the cache. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>