v0.10.2

[0.10.2] - 2026-09-11

Fixed

• The one-time Zig download no longer depends on ziglang.org being reachable.
  It now pulls from a random Zig community mirror, with ziglang.org kept only
  as a last resort, and tries the mirrors in turn on failure. ziglang.org
  rate-limits the multi-megabyte tarballs and had been timing out mid-build,
  with no fallback (baronunread/sproutboat#166). The archive sha256 is still
  enforced whatever the source. SPROUTBOAT_ZIG_URL overrides the source;
  SPROUTBOAT_ZIG still points at a prebuilt binary.
• A leftover ~/.cache/sproutboat/zig-<version>/ directory from an earlier
  cache layout is removed on the next build instead of sitting unused.