The µ⊕∇B Protocol — Integrated Muography–Magnetometry Concept

We present a single theoretical concept: an integrated subsurface‑sensing model unifying muon coincidence counting, pT‑class magnetometry, thermal‑boundary control, and a flow–acoustic boundary. No hardware exists; all values are targets. A dual‑compartment, single‑volume layout reduces coupling; baseline internal magnetic noise <10 nT (stretch <1 nT) and effective gain drift <5% (stretch <1%). A µ ⊕ ∇B fusion pipeline with a temporal‑correlation filter yields a probability volume with calibrated uncertainty. Calibration employs a Calibration Cube and a 10‑min sky‑flat. Optional bio‑interfaces include a pollen bio‑porous mat, a bio‑magnetic compass, and an adaptive “living acoustic damper” (moss humidity‑tuned) plus microbiome‑informed de‑noising and optional bio‑dust noise sculpting—all framed as low‑ΔP, QA‑oriented layers. Edge‑first inference & hierarchical processing minimize bandwidth/compute. Validation (bench → 3‑node → pilot) targets: 1–10 Hz·m⁻², ≥×10/≥×30 rejection, flow–acoustic ≥6 dB (stretch ≥10 dB) and ΔP ≤150 Pa (stretch ≤100 Pa), and 0.5–1.0 m localization for >1 m³ with 10–30 nodes (scale 20–50 for <0.3 m).