docs(wiki): sync with v1.2.2 Zero-Trust Serial Fallback - Home: v1.2.0 -> v1.2.2, TOC annotated, release/DOI footer - Hardware: FreeRTOS dispatcher, RetentionRing, offline clock, SerialFallback framing, GNSS-ready last-known NVS fix - Cryptographic: geohash fast-path, identical MQTT/serial ECDSA, re-sign on drain, NULL geometry handling - Data Plane: Host Serial Bridge as second ingestion path (serial_bridge.py, SSRF guard) - Backend: Redis Streams + TimescaleDB + per-area geohash cooldown (was List + per-zone) - Glossary: DeliveryPath, RetentionRing, Offline Wall Clock, SerialFallback, Geohash Zone Index
docs(wiki): split Home into 8 topic pages and add AI Emergency Report Service (v1.2.0)