R-01 does not support the knowledge-limitation hypothesis at dGR203 for the evaluated 6.5-day simultaneous-center visibility decision because the nominal terrain, all five evaluated NASA clones and the separate Product-104 representation preserve the season-wide classification, and no terrain-driven classification flip occurs in the tested operational grid.

The primary broad search (2026-10-01 through 2026-12-15 UTC) gives a nominal
longest simultaneous window of **13.227474 days**, from
2026-10-21T00:22:06.709Z to
2026-11-03T05:49:40.475Z. Five official clones give
**13.225631–13.226919 days**; Product 104 gives **13.226543 days**.
All exceed the historical 6.5-day research benchmark. These are geometric
visibility statements, not mission approval, electrical power or radio-link guarantees.

On the separate fixed-start grid, **0 of 90** evaluated terrain/state
combinations meet the uninterrupted requirement. The preregistered anchor is
November 10 00:00 UTC, with +/-12-hour starts and five 10 m position states.
The resulting regime is **ROBUST**, conditional on this grid. A
season-wide opportunity and failure at these selected starts are compatible.

The literature-domain calculation (November 6 through November 27 inclusive)
gives **8.471310 days**, right-censored at November 28 00:00 UTC,
or **+1.471310 days** relative to the approximate seven-day
reference. The discrepancy is preserved and has not been uniquely attributed.
No terrain or visibility criterion was fitted to that reference.

Terrain representations are not identical: Earth-only window durations and
transition times change. The negative finding concerns the specified
classification, not zero terrain uncertainty. This is a limited pilot;
the nominal primary result is not especially close to 6.5 days and the
fixed-start grid can have low power to reveal near-threshold sensitivity.
It does not establish universal stability or a calibrated probability.

Do not expand to all 100 clones automatically. First review the literature
discrepancy, inherited Product-104 frame chain, far-field uncertainty,
discovery/azimuth limitations and a preregistered next experiment with
informative operational margins. See validation_report.md, limitations.md,
negative_results.md and R01_ENGINEERING_REPORT.md.