feat: add ADR-042 CHCI protocol, 24 new edge modules, README restructure

- ADR-042: Coherent Human Channel Imaging (non-CSI sensing protocol)
  with DDD domain model (6 bounded contexts)
- 24 new WASM edge modules: medical (5), retail (5), security (5),
  building (5), industrial (5), exotic (8)
- README: plain-language rewrites, moved detail sections below TOC,
  added edge module links to use case tables, firmware release docs
- User guide: firmware release table, edge intelligence documentation
- .gitignore: added rules for wasm, esp32 temp files, NVS binaries
- WASM edge crate: cargo config, integration tests, module registry

Co-Authored-By: claude-flow <ruv@ruv.net>

.gitignore

@@ -9,6 +9,12 @@ firmware/esp32-csi-node/components/wasm3/wasm3-src/
 # NVS partition images and CSVs (contain WiFi credentials)
 nvs.bin
 nvs_config.csv
+nvs_provision.bin
+
+# Working artifacts that should not land in root
+/*.wasm
+/esp32_*.txt
+/serial_error.txt
 
 # Byte-compiled / optimized / DLL files
 __pycache__/