nx_sol_lib.nx

nx_sol_lib.nx -- STATUTE OF LIMITATIONS deadline engine. Exact calendar arithmetic, fail-closed. Missing a limitations deadline is the single most common legal-malpractice claim. The hard part is not the subtraction -- it is CORRECT CALENDAR ARITHMETIC: 'two years from the accrual date' means the same civil date two years later, and naive day-counting (period * 365) drifts by a day per leap year and mishandles a Feb-29 accrual. This organ computes deadlines on exact proleptic-Gregorian day numbers (Howard Hinnant's algorithm: days since 1970-01-01, valid for any year), so leap years and the Feb-29 -> Feb-28 clamp on year addition are handled by construction. *FAIL-CLOSED ON MISSING DATA (the flagship): if the accrual date or the period is unknown, the deadline is SOL_UNKNOWN and sol_status returns UNDETERMINED-FOR-REVIEW -- it will NEVER tell a client a claim is still open or already time-barred on data it does not have. A confident wrong answer here ends a career. Models the two doctrines that move the clock: TOLLING (the clock pauses -- defendant absent, plaintiff a minor -- so tolled days push the deadline OUT) and the DISCOVERY RULE (for a latent harm the clock starts at discovery, not the wrongful act). Day numbers are signed integers; no float, no wall-clock read. license_tier: ORIGINAL No hw writes (Rule 26). LIB.