The Griffiths Electromagnetically‑Governed Hydrogen Combustion Engine (H₂‑EM Engine v1.1) introduces a new combustion architecture in which hydrogen ignition, flame‑kernel formation, and flame evolution are governed by electromagnetic fields rather than mechanical containment or conventional spark‑ignition control. Hydrogen’s extreme reactivity has historically created instability pathways—backfire, pre‑ignition, knock‑like excursions, and uncontrolled flame growth—that form the core bottleneck preventing widespread adoption of hydrogen internal‑combustion systems. The H₂‑EM Engine directly addresses this bottleneck by replacing passive containment with active electromagnetic governance. The architecture integrates three foundational innovations: 1. EM‑Gated Combustion — Solving the Instability Bottleneck Plasma‑locked ignition and field‑gated ignition zones confine flame‑kernel formation to a tightly bounded region. Outside this region, suppression fields collapse nascent kernels, reducing unintended ignition probability by several orders of magnitude. This directly mitigates hydrogen’s long‑standing instability issues and enables stable ultra‑lean combustion. 2. EM‑Governed Storage & Handling — Solving the Safety & Infrastructure Bottleneck RF/microwave dielectric‑shift sensing provides continuous hydrogen leak detection (“hydrogen radar”), while EM ignition‑suppression volumes protect manifolds, regulators, injector rails, and service bays. On‑demand hydrogen generation via microwave cracking of safer carriers (NH₃, methanol, LOHC) reduces stored H₂ mass and eliminates many high‑pressure storage risks. This addresses the second major bottleneck: hydrogen’s fragility in real‑world handling. 3. Predictive Supervisory Governance — Solving the Control Bottleneck A Belle‑derived control layer integrates ionisation sensing, EM‑field modulation, mixture governance, and pre‑ignition prediction to maintain operation within a bounded multi‑domain envelope (ignition, EM field, thermal, lean‑burn, cracking, and fault envelopes). The system is designed for fault‑graceful behaviour rather than catastrophic failure, overcoming the third bottleneck: the lack of robust, predictive control in hydrogen engines. The document includes governing equations for plasma‑kernel formation, EM confinement, flame‑front ionisation dynamics, dielectric‑shift leak detection, and microwave cracking energy balance. A worked example demonstrates field‑gating requirements for a 1.5 L cylinder at 10 bar and λ = 2.0, showing that suppression fields of ~25 kV/m and gating fields of ~60 kV/m are achievable with quadrupole coil geometries. By replacing containment with governance, the H₂‑EM Engine provides a credible, buildable pathway for overcoming hydrogen’s three historical bottlenecks—instability, storage risk, and control fragility—enabling safer, leaner, and more predictable hydrogen combustion. This work extends the Griffiths Canon of field‑bounded physics, predictive governance, and envelope‑defined operation into terrestrial energy systems.