The Euler-Mascheroni Constant from Icosahedral Geometry: v3.4 Retirement Notice

v3.4 changes from v3.3:Mr Adversary cycle-4 review fixes incorporated — the "0.013%" figure used for γ ≈ 1/√3 disambiguated wherever it appears (the absolute reading is correct as published; the relative reading is ≈0.023%; both noted parenthetically to prevent misreading by a calculator-equipped sceptic), §4 candidate (a) sharpened by one sentence naming why face-internal 1/√3 is generic to triangular-faced polyhedra (tetrahedron, octahedron) so that what makes it 2I-specific must be the global geometry rather than the face, §4 candidate (b) folded to a single line acknowledging that other projection candidates exist but are too under-specified to commit to here, §2.1 closure-claim citation gap closed by referencing Paper 117 (Spectral Gap and Origin of Discreteness), and §5 closure-ladder reconciliation between Paper 2 and Paper 157 α-formulae softened from declarative to conjectured. Programme name updated from "Bootstrap Universe Programme" to "2I Universe Programme" throughout to match current programme convention (the rename does not affect content or DOI continuity). Substantive content unchanged from v3.3; structural decision unchanged from v3.0.