Template kit 1.6.2: every option accepts the --name=value form

Changed

• Every option accepts --name=value as well as --name value: the kit's argument parser splits
  a joined option on its first equals sign, so --host=0.0.0.0 binds the preview to the network
  the way --host 0.0.0.0 does, and --out=dist is the same as --out dist. Before this, a
  joined option was read as a flag whose name included the value and the value was lost. The hint
  that dev printed for --host=address is gone because the form now works; a bare --host
  still stops with the hint. The parser lives in src/lib/args.mjs with its own tests.

Compatibility and release

No contract change: templates validate and preview as before, and every spaced option behaves as
it did. Nothing on the platform side is needed for the joined form. Publish through the mirror's
GitHub Release workflow; the matching platform change is multi-tenant-services #356.