OP-ASTRO1 proposes W_hab, a structural habitability index treating a planet as a dissipative network of eight coupled subsystems with thirteen coupling arcs. Each arc weight is computed from continuous Gompertz and log-normal potential functions — no discrete switches, no empirical multipliers. The critical threshold W* = e⁻¹ is derived analytically within EGESB-G₂. Solar System calibration confirms the framework (P4 test). Noachian Mars is correctly classified as structurally habitable under the geometric mean metric. Applied to TRAPPIST-1e, the framework predicts S1 with a dense secondary atmosphere and S3 without — directly testable with JWST programs GO 6456/9256. The epistemological boundary is stated explicitly: W_hab > W* is necessary but not sufficient for life. Additional notes: The full LESE-EIA implementation is proprietary. This paper provides the complete methodological protocol for independent reimplementation. Collaboration under IP agreement: contact via ORCID 0009-0007-2169-4215.