feat(L1+L2): Phase D slice 4 Phase 3b Stage 1b — closed-value substitution + preservation_l2 β closure (closes #249)#253

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proof-debt/phase-3b-stage-1b-tfuneff-substhyperpolymath/ephapax:proof-debt/phase-3b-stage-1b-tfuneff-substCopy head branch name to clipboard