Push Telemetry

[gjelsoe]

Add ReportEngine: automated reporting and alerting for repeater nodes (Push Telemetry)

This PR adds a script/rule engine (ReportEngine.cpp / ReportEngine.h) to repeater firmware, enabling nodes to automatically send messages to a channel based on sensor readings or a fixed schedule — without any user interaction.

Supported triggers

• Battery voltage threshold (bat<, bat>)
• Temperature threshold (temp<, temp>)
• Noise floor threshold (noise>, noise<)
• Periodic reporting (report:bat, report:temp, report:noise)

Features

• Optional time-of-day firing (at:HH:MM, UTC)
• Hash channel and private channel support
• Optional region scope (@scope:name)
• Rules persist across reboots via SPIFFS/LittleFS
• Deferred SPIFFS save to avoid blocking CLI on nRF52
• Remote CLI support with paged compact list output (160-byte limit)
• Local CLI (USB) supports full list output
• Minimum 30-minute interval enforced to protect duty cycle

Rules are configured entirely via CLI — no recompilation needed. For full command reference see REPORT.md.