Earth-Taboo Days (犯土・土用間日) (犯土與土用間日)

THE EARTH-TABOO DAYS — when the Japanese almanac says the ground may not be broken, the domain of 土公神 (Dokujin), the earth god. TWO INTERLOCKING SYSTEMS: 犯土 (tsuchi) — the fifteen-day pillar window with the god in the soil: 大犯土 (庚午…丙子, seven days), the single exempt 間日 丁丑 between the runs, then 小犯土 (戊寅…甲申) — digging, wells, sowing and above all the 地鎮祭 ground-breaking rite shunned, the 7+1+7 consecutive-run structure ASSERTED at load; and the 土用の間日 — within each of the four doyō earth-phases (the catalogue's seasonal engine's own solar-longitude spans), the exempt branches (spring 巳午酉, summer 卯辰申, autumn 未酉亥, winter 寅卯巳) when, tradition says, MONJU BOSATSU INVITES THE EARTH GOD TO HEAVEN and the soil stands unguarded. THE CROSS-LOCK: the 2026 spring doyō (17 April – 4 May) is anchored at load against the published Japanese almanac record — an external witness proving the seasonal engine's span — and the published 3–6-exempt-days-per-doyō claim is counted and asserted. The god's seasonal residences (hearth, gate, well, garden) served as the folklore they are; two witnesses throughout (ja-Wikipedia against the koyomi8 reference). Japanese becomes twenty-one systems. Tradition-report, never construction advice. Pure compute, no LLM.

Cost: 1 TIAN Points per call. tRPC procedure tsuchi.day.