Complete-Period Traversal of the 8–24 Tishri Corridor and the Fixed-Calendar Lookback-Sum Bands (Supplement to Danielic Chronology V5)

Version 6 changes This version adds three results to the Version 5 supplement. (1) Uniqueness: an exhaustive sweep of every anchor-day in the Hebrew year — all 414 month-day positions across the fourteen month labels, evaluated over the complete 689,472-year period — shows that the days satisfying both landing conditions universally are exactly Tishri 8–24. The corridor of the principal papers is the unique such window in the year (full_year_sweep_batched.py; complete per-day results in full_year_sweep_results.json). (2) Interior indistinguishability: a theology-blind re-evaluation of the six festal anchor classes (six_anchor_test.py) and its extension to every day of Tishri (full_corridor_test.py) show that all sixteen interior corridor days, 9–24 Tishri, produce identical full-period month distributions; calendar arithmetic cannot distinguish any interior day from any other. (3) Interval perturbation: per-terminus safe zones for both lookback intervals (interval_perturbation_test.py, interval_perturbation_edges.py) show constant zone widths of 27 and 26 days sliding one-for-one with the terminus, with every corridor terminus near a zone edge on at least one leg. This section removes a robustness claim rather than adding one. No figure in any prior section is altered. The ten files of Version 5 are carried forward unchanged. The new results strengthen the arithmetic envelope (uniqueness of the window) and bound it honestly (per-terminus interval margins); they supply no additional support for the theological selection of any terminus within the corridor.