Fennek v1.9.2

Added

• BATTLOG — opt-in battery & activity logger (services/battlog). When the BATTLOG build flag is set, the firmware writes one record per event (app switch, audio track, mesh radio on, Wi-Fi on/off, standby/wake) and a battery probe every 60 s to /.fennek/battery.log (timestamp + %/mV/charging? + Wi-Fi/mesh status). It's a throttled PSRAM ring flushed to SD before standby, and downloadable via the Web file manager — useful for diagnosing real-world battery drain. Deliberately zero-cost when the flag is off (all BATTLOG_* calls compile to nothing).

🌐 Project page & screenshots: https://fennek.dumke.me

Full changelog: CHANGELOG.md