Seam rigidity route
v348_seam_rigidity_route.py · core
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Route B (the rigidity route) for the one open arrow L2, carried out -- it lands on a strikingly SIMPLE statement: the whole keystone reduces to ONE question, does the raw seam carry the golden ratio? [E] rigidity closes the crystallographic part: the order-4 clock has a UNIQUE normal form z->iz (Nielsen/Kerckhoff, v180), Troyanov gives the unique flat pillowcase metric (v284). [E] downstream is a LATTICE identity: E8 = the ring of icosians (Conway-Sloane), rank 8, so 2I->E8 is a lattice identity (stronger than McKay v219). [E] the single bridge is phi: crystallographic orders {1,2,3,4,6}, the 5-fold non-crystallographic; mu4 crystallographic, 2I (5-fold) not, phi=2cos(pi/5) extends one to the other (quasicrystal). [O] the keystone reduces to ONE question: 'does the raw seam carry phi?' -- if yes, mu4+phi -> 2I -> E8 closes L2. [O] honest subtlety: TFPT's phi is currently E8-side (v312/v313); the raw-seam data (cusp {0,1/3,2/3}, recovery (2/3)^6, seed phi0) are not manifestly golden, so showing the RAW seam carries phi non-circularly is the residual (= L2). NOT closed.
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