* feat: declared dates as date values
- graph format:date/date-time inputs and policy date properties arrive as
dates that keep their original text for output, string() and string
functions
- d() keeps the instant of offset/Z strings, resolves DST gaps and accepts
ISO forms without offset, compact, slash-separated, YYYY-MM and YYYY
- dates compare with date strings in ==, !=, <, >, in and contains, and
concatenate with strings; deprecated date helpers accept dates
- string(date), type() reports date, and date-to-string at string inputs
* fix: close review gaps in date inputs
- parse new date formats by exact shape; keep master formats first and
guard DST-gap and extreme-year overflows
- text-carrying dates act as strings for object keys, in-object, index,
slice, concatenation and bool
- deprecated helpers fall back to the date instant; time() accepts dates
- schema-less child inputs receive date text; dates satisfy string
parameters and slicing in the type checker
- convert policy input before validation so dates are parsed once;
share rewrite helpers between graph and policy conversion
* fix: align date text, unions, references and child inputs
- every valid date exposes a text form (original or RFC3339), so string
functions and slicing on computed dates match the type checker
- date and string types merge to string; reference ids typed as dates
resolve through their text
- input nodes convert declared dates and hand every other converted date
back as its original text, following combinators only for structure
- date format checks no longer allocate
* feat: date v2
* implement more date functions
* improve type safety
* add more methods for dates
* update utc to tz and add support
* add unary node behaviour for date methods
* add tests; fix errors in bindings
* add date operators
* fix types
* change set date signature
* update nightly
stefan-gorules