Initial: backup from Claude Project 'Весовое оборудование'

- PROTOCOL.md: topology, JSON schema, MQTT topic, auth, retry logic
- HARDWARE.md: components, GPIO map, ASCII wiring, power, calibration
- FIRMWARE_NOTES.md: stack (ESP32 core 3.x), libraries, main loop, known issues, TODO
- INDEX.md: manifest + current status + blockers

Current blocker: TITAN 9 P5 default = no RS232 output.
Fix: call Zemic +7(472)277-71-19, set P5=3, then test on-site.
Related server repo: admin/scales

.gitignore

@@ -0,0 +1,6 @@
+.DS_Store
+*.swp
+*.tmp
+Thumbs.db
+node_modules/
+build/