The api documents both as a union with a positional array because both
are accepted as input, which makes every read of `.x` or `.left_top`
optional. Everything read back from the game uses the named form, so
the positional variant is removed and we now always write it that way
too.
The spawn area config offsets and the mine depletion search areas were
the only positional writes left, and apply_offset no longer needs its
fallback.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`Roles.new_role` returned the result of `error`, which made it nullable,
and `set_permission_group` returned nil for an unknown group, which
broke the config chain with an index error rather than saying so.
Positions and bounding boxes read back from the game always use the
named members, so they are narrowed once where they enter a function.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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