enbility / spine-go / 16068877111

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✨ feat: implement calendar-aware ISO 8601 duration formatting (#62)

Replace seconds-only duration formatting with calendar-aware conversion
that preserves year/month structure in ISO 8601 output.

- Use time.AddDate() for accurate calendar calculations
- Preserve duration structure (P1Y2M vs PT31536000S)
- Handle negative durations and fractional seconds
- Add comprehensive documentation of period library limitations
- Document when approximation errors occur (months/years only)
- Add validation test for issue #60

Improves #60

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