reclaim-disklisted

# Reclaim disk from cargo target dirs Sharing `target-shared/` removes the *multiplication* — one directory instead of one per branch — but only for builds that go through `mise run`, and not the growth: every branch that builds here leaves artifacts behind and cargo never collects them, so `target-shared/` creeps up on a disk that has run out once already. Bare-`cargo` worktree dirs put the multiplication back, quietly, which is how that disk reached zero bytes free. `mise run sweep` bounds all of them. `mise run sweep` reclaims space in **every** target dir this repo accumulates — the shared one and each worktree's private one — dropping artifacts unused for 7 days (installs `cargo-sweep` first if missing). It walks `git worktree list` via `scripts/sweep-targets.sh` and lets each checkout resolve its own directory. - It refuses to run while a `cargo` build is, since the oldest artifacts in a shared directory are usually dependencies a live build is still linking against; `SWEEP_FORCE=1` overrides. - `SWEEP_ARGS` replaces the default, e.g. `SWEEP_ARGS='--dry-run --time 7'` to preview, or `SWEEP_ARGS='--maxsize 50GB'` to bound each directory by size instead of age.