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Standardized ID prefixing for multiple
independent calendars within HEXCRAFT. Format:
[CALENDAR-ID]-[NNNNN]. HEX-00057 = Day 57 of
personal 10,000 days. HOS-00001 = Day 1 of
HexOS development. LLC-00012 = Day 12 of
HEXCRAFT LLC. Rules: unique sequences, defined
anchor dates, distinct prefixes, full IDs in
filenames. Prevents collisions, maintains
readability, enables cross-referencing between
calendars.
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