Three exploratory research documents under docs/research/:
- architecture/three-tier-rust-node.md (3,382 words) — exploration of a
dual-ESP32-S3 + Pi Zero 2W node architecture with BQ24074 power-path,
ESP-WIFI-MESH + LoRa fallback + QUIC backhaul, and an esp-hal/Embassy
vs esp-idf-svc Rust toolchain split. Status: Exploratory — not adopted.
- sota/2026-Q2-rf-sensing-and-edge-rust.md (3,757 words) — twelve-section
state-of-the-art survey covering WiFi CSI through-wall pose, IEEE 802.11bf
(ratified 2025-09-26), edge ML on ESP32-class hardware, embedded Rust
ecosystem maturity (esp-hal 1.x, esp-radio rename, embassy-executor
ISR-safety on esp-idf-svc), LoRa for sensor mesh fallback, QUIC for IoT
backhaul, solar power-path management beyond BQ24074, mesh routing
alternatives, and Pi Zero 2W secure-boot reality.
- architecture/decision-tree.md (1,461 words) — Mermaid decision tree
mapping each load-bearing decision in the three-tier proposal to its
dependencies, evidence-for-yes/no, and prospective ADR slot.
No production code, firmware, or ADRs touched. Research-only.
Co-Authored-By: claude-flow <ruv@ruv.net>
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