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Keep weft's build folders to what is still used - #99
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weft's build folders grew by a full copy of weft at every update. Now each keeps only what is still used, with no time rule:
worker-target/): each program weft builds records the compiled units and shared source crates it used (used.jsonbeside it). After every build a lane and the seed keep only what some program on the machine was built from.worker-crates/): same record. A build holds a shared lock from staging until its compile ends, so a reclaim never removes what a build in flight needs.target/(setup.shfrom source):weft trim-cargo-targetkeeps, of the units built the same way, the newest, plus everything the newest top-level builds were built against. Measured on a real tree: tests, clippy, e2e and release builds recompile nothing after the trim.Removes the old 30-day / three-versions rules and
WEFT_TARGET_CAP_GB.