TCV-ϕ VIII: toward a one-scalar completion from cohesive-vacuum topology and coherent-sector Φ2 emergence

This eighth paper investigates whether the ultralight Phi2 sector of the canonical TCV-ϕ programme can be reinterpreted as an emergent collective mode of the CC-Phi1 cohesive microstructure. The study is organized as a reproducible inverse/direct pipeline: PMNS-like flavour constraints are translated into modal and topological requirements, candidate cluster geometries are compared under common diagnostics, and the leading candidates are tested against Phi2 emergence, reduced homogeneous ULDM-like evolution, and microscopic closure criteria. The main result is structural rather than theorem-level: closed twisted topologies are consistently favoured over rigid or open cluster toys, and the twisted-multi-ring geometry gives the strongest combined PMNS + Phi2 bridge signal. In the full twisted-multi-ring bridge, the calibrated emergent mass is m2 ~ 8. 98e-23 eV, the joint pass fraction is ~0. 994, the robustness fraction is ~0. 718, and the reduced homogeneous evolution is compatible with rho proportional to a^-3. Micro-closure remains partial rather than complete, and the most conservative interpretation is that Phi2 is currently supported as a coherent-sector effective mode of CC-Phi1 rather than as a full microscopic closure of the entire microstructure.