Implements Phase 1 and 2 of the syntax rework plan:
- Brackets `[]` are now mandatory for all tuple and array values.
- Removed the `[Type][]` array syntax; arrays now only use `Type[]`.
- `[single]` is now strictly a 1-tuple rather than an array.
- Updated documentation and test fixtures to reflect these breaking
changes.
Improve the `ValueParser` to correctly disambiguate between empty
arrays `[]` and the start of nested structures. This ensures that
the parser can distinguish between an array containing a single
element that starts with a bracket and an actual empty array.
Update tests to reflect that parsed tuples are returned as arrays
rather than objects.
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