This preprint presents co-emergent dual-modal holography, a groundbreaking framework where discrete information (Bit) and continuous geometry (Analog) co-emerge in bidirectional symbiosis: geometry generates information possibilities, while information stabilizes geometry. Extending Wheeler's "It from Bit" to a full bidirectional cycle, we derive the universal bound , unifying the Bekenstein bound, area-law saturation, and holographic duality through an effective IR action with non-minimal ξ R I² coupling. The theory reproduces black hole thermodynamics, demonstrates discrete topological order via ℤ₂ tensor networks, and predicts testable IR photon dispersion consistent with Fermi-LAT GRB constraints and verifiable with future instruments (CTA, JWST). This participatory paradigm reinterprets foundational phenomena (light speed invariance, interference, entanglement) and resolves major puzzles in cosmology (horizon/flatness problems, Hubble tension, dark energy), quantum gravity (information/firewall paradoxes, time emergence), and particle physics (neutrino mass, hierarchy, strong CP), offering a unified view of the participatory universe. Comments and feedback welcome. No funding to declare.