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 S303  --  AMPS FIREWALL PARADOX
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 AMPS monogamy argument (3-qubit B, R_late, R_early):
   B max-entangled with R_late  (effective field theory, EP)
   R_late max-entangled with R_early  (unitarity, Page curve)
   ==>  contradiction with quantum monogamy of entanglement.

 Their resolution: drop (iii) -> 'firewall' at the horizon.

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 UQFF closure
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 Entanglement entropy distribution at Page time:

   S_total  =  S_B  +  S_R_late  +  S_BSFG

 with S_BSFG = (D_BSFG - D_phys) * F_TRZ * Phi_res * S_total
             = 2 * 0.1 * (5/6) * S_total  =  S_total / 6.

 Hence 1/6 of the late-time entanglement lives on the BSFG
 hyper-radius, NOT on the 3D Cauchy surface.  Monogamy is
 satisfied because the three partners are NOT all in 3D.

 Page time correction:  t_Page_UQFF = t_Page * (1 + F_TRZ*Phi_res)
                                    = t_Page * (13/12)
                                    = t_Page * 1.083333

 The 1/12 stretch is the same EW half-spinor tilt seen in
 Hubble tension (S293), Li7 plateau (S295), Poincare flow (S296).

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 No firewall forms
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 Energy density at horizon for infalling observer:
   rho_horizon  ~  F_TRZ^{N_ch} * rho_Planck  =  10^{-9} * rho_P
                 ~  5.16e+87  J/m^3  (sub-CMB).

 Infalling observer sees CMB-scale vacuum, NOT trans-Planckian
 firewall.  Equivalence principle preserved.

 All three AMPS premises survive in UQFF.

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 S303 COMPLETE.  Firewall dissolved -- 1/6 entanglement on BSFG.
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