E_1 physics complete

Book V closes the E_0 to E_1 construction. Book III identifies the physical carrier, Book IV reads the T^2-fiber as microphysical ontology, and Book V reads the τ^1-base as temporal, gravitational, thermodynamic, and cosmological structure. The result is not full empirical validation; it is a complete internal physical grammar with explicit external-validation seams. Books VI – VII receive that physical grammar and ask when carrier regimes can preserve, transmit, decode, update, and finally reflect on code.