How do selected Fibonacci ratios scale prior-session range around a central pivot? Walk the evidence clock one stage at a time. This lab teaches the publication contract; it does not simulate returns, platform parity, or trade performance.
Selected expression
P=(H+L+C)/3; R_k=P+f_k(H-L); S_k=P-f_k(H-L)
Availability rule
A level derived from a prior session becomes available only after that source session is final; a confirmed pivot becomes available only after its declared confirmation lag.
calculated · step 1 of 7
Verified synthetic fixture
This lab is paired with datasets/implementation-fixtures.json: 96 deterministic, oldest-to-newest observations spanning oscillating, rising, and moderating regimes. It is teaching data—not market history or predictive evidence.