md updates

docs/ARCHITECTURE.md

@@ -600,7 +600,7 @@ Handles the binary BLE protocol with ~50 command opcodes. Key features:
 - **ACK tracking**: 8-slot table, computes expected ACK = SHA256(secret + hash)[0:4]
 - **Contact iteration**: Streaming protocol with `lastmod` filtering for incremental sync. The dump advances only
   while a client is connected and every connected transport has room; it is cancelled when the last client leaves
-- **Lazy write batching**: Dirty contacts/channels flush after 5-second delay
+- **Lazy write batching**: dirty contacts and channels are written 5 s after the last change, so a burst (a contacts import) is written once; a contact change that only refreshes liveness waits up to an hour (`LAZY_WRITE_LIVENESS_MS`)
 - **Protocol versioning**: V2/V3 frame format negotiation with phone app
 - **Ed25519 signing**: 3-phase flow (start→data→finish) for signing up to 8KB
 - **Flood scope**: Transport key filtering for region-scoped sends
@@ -850,7 +850,7 @@ Repeaters and room servers default to `CONFIG_ZEPHCORE_REPEATER_GPS_INTERVAL_SEC
 
 ### 7.5 Board (`adapters/board/`)
 
-- Battery ADC with optional regulator-gated voltage divider, 8-sample average (boards with `zephyr,user` ADC node; MG24 has no battery divider, ADC disabled)
+- Battery ADC with optional regulator-gated voltage divider, 8-sample average (boards with `zephyr,user` ADC node; MG24 has no battery divider, ADC disabled). A board with a fuel gauge (AXP2101) reads voltage and charge from it instead; one with an nPM1300 charger (XIAO nRF54LM20A) reads the voltage from the PMIC's own ADC through the sensor API and takes the percentage from the discharge curve
 - UF2 bootloader entry via GPREGRET magic (0x57 = UF2, 0xA8 = BLE DFU)
 - TX LED bracketing for LoRa transmissions (gated by the LED master switch below)
 - Bootloader version detection via flash memory scan

releasenotes/RELEASE_NOTES_1.17.7-zephcore.md

@@ -66,6 +66,20 @@ valid.
 Thanks to **ptr727** for finding and fixing this
 ([PR #99](https://github.com/liquidraver/ZephCore/pull/99)).
 
+Four more clock-chip fixes, also from **ptr727**:
+
+- **RAK4631 with a RAK12002 clock module**: the module is now used, and its switchover to the backup
+  supply is stored in the chip, so the clock keeps running when the board loses power
+  ([PR #98](https://github.com/liquidraver/ZephCore/pull/98)).
+- **RX8130CE**: the weekday was written in the wrong encoding. Time and date were not affected
+  ([PR #101](https://github.com/liquidraver/ZephCore/pull/101)).
+- **A time outside 2000-2099 is no longer written to a clock chip.** The chip stores only two digits
+  of the year, so a time before 2000 came back after a reboot as a date late in this century
+  ([PR #105](https://github.com/liquidraver/ZephCore/pull/105)).
+- **RV-3028 left in 12-hour mode by other firmware**: it is switched back to 24-hour mode at boot, so
+  the hours are read correctly
+  ([PR #106](https://github.com/liquidraver/ZephCore/pull/106)).
+
 ## USB companion: a hang right after boot
 
 A companion on USB could stop responding when the host sent it a command straight after opening the
@@ -161,6 +175,8 @@ matches the SoftDevice version of your bootloader.
   puts it back to 47 hours.
 - **Malformed encrypted packets are rejected earlier**, before any cryptography runs.
 - **Large contact lists**: up to 24 contacts can share the same one-byte hash, up from 8.
+- **`sensor list`** with a negative start index is rejected instead of being used
+  ([PR #100](https://github.com/liquidraver/ZephCore/pull/100), thanks to **ptr727**).
 - **T1000-E**: a pin that was wrongly driven as a sensor enable is left alone. Sensor readings are
   unchanged.
 - **LR2021 with `rxduty` on** (MeshTracker X1, both LR2021 EVK kits): after every noise-floor