Observer-plane reduction theorem
Question
Can an observation plane be reduced to a quantitative operational geometry rather than treated only as an SCC certification coordinate?
Claim boundary
The result is a finite-dimensional linear theorem with frozen calibration, constructor closure, source module, and common-frame authority. It does not identify operational domains from spectra alone, equate effects with physical instruments, or prove completion stability.
Disposition
The observer-plane reduction packet defines the constructor-closed Gramian, proves that its radical is behavioral indistinguishability, and equips the quotient carrier with a positive operational metric. Compatible probe addition is monotone in Loewner order and intersects transported kernels. The packet separates domain identity from spectral strength, adds the instrument-backaction boundary, gives coefficient-aware replacements, and records the exact toric rank ladder from zero logical directions through one marked loop to two independent loop probes.
Epistemic graph admission: ev-000000009856-7c41e82d-6a44-4c21-a64f-4687daac5fa8. Author: marici.Kitaev (team_member:2ec122bc41a1fea3b5ab).