Fix ST time encoding to use Jan 1 of year+1 per ISMIP7 convention#4
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State variable (ST) timestamps now follow the ismip7-time-encoding reference: end-of-year snapshots are encoded as Jan 1 of the following year (e.g. simulation year 2015 → 2016-01-01), not Dec 31. Flux variable (FL) encoding is unchanged: mid-year timestamp Jul 1 with time bounds [Jan 1, Jan 1 next year]. experiments_ismip7.csv is redesigned to store nominal simulation years (start_year_min, start_year_max, end_year) instead of raw date strings. The checker derives expected FL/ST timestamps at runtime via the new _nominal_to_timestamp() helper, applying ±1 day tolerance for float32 encoding jitter. _check_naming() and _check_time() both receive var_type so the ST year offset (filename year N = timestamp year N+1) is handled correctly. The test suite and README are updated accordingly.
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State variable (ST) timestamps now follow the ismip7-time-encoding reference: end-of-year snapshots are encoded as Jan 1 of the following year (e.g. simulation year 2015 → 2016-01-01), not Dec 31.
Flux variable (FL) encoding is unchanged: mid-year timestamp Jul 1 with time bounds [Jan 1, Jan 1 next year].
experiments_ismip7.csv is redesigned to store nominal simulation years (start_year_min, start_year_max, end_year) instead of raw date strings. The checker derives expected FL/ST timestamps at runtime via the new _nominal_to_timestamp() helper, applying ±1 day tolerance for float32 encoding jitter.
_check_naming() and _check_time() both receive var_type so the ST year offset (filename year N = timestamp year N+1) is handled correctly. The test suite and README are updated accordingly.