docs: document GPS duty-cycling and RXPS watchdog

Settings screen doc gets the new "GPS pwr" row and a watchdog note on
"Pwr save"; Diagnostics doc gets the new "RXPS wd s/h" row and updates
what "Reset counters" actually clears; release-notes.md gets Unreleased
entries for all three additions from the prior commit.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/solo_features/settings_screen/settings_screen.md

@@ -70,7 +70,7 @@ Lists all available home screen pages. For each entry:
 | SF        | 5–12       | LEFT/RIGHT. Spreading factor. |
 | BW        | 7.8–500 kHz | LEFT/RIGHT cycles the standard LoRa bandwidths. |
 | CR        | 5–8        | LEFT/RIGHT. Coding rate (4/5–4/8). |
-| Pwr save  | ON / OFF   | **Battery saver.** Hardware duty-cycle receive: the SX126x cycles RX↔sleep on its own and wakes on a preamble, cutting average RX current. Trades a little receive latency; leave OFF for lowest-latency reception. Requires an SX126x radio (otherwise stays on continuous RX). **Forced off (shown as `--`) while the repeater is on** — a repeater must listen continuously; your setting is restored when the repeater is switched off. |
+| Pwr save  | ON / OFF   | **Battery saver.** Hardware duty-cycle receive: the SX126x cycles RX↔sleep on its own and wakes on a preamble, cutting average RX current. Trades a little receive latency; leave OFF for lowest-latency reception. Requires an SX126x radio (otherwise stays on continuous RX). **Forced off (shown as `--`) while the repeater is on** — a repeater must listen continuously; your setting is restored when the repeater is switched off. A background watchdog recovers automatically if the duty-cycle sequencer ever gets stuck (soft re-arm, then a full radio reset) — see Tools › Diagnostics for the recovery counts. |
 | Auto pwr  | ON / OFF   | **Adaptive Power Control.** Lowers actual TX power on strong links to save energy, ramping back up — to the **TX Pwr** ceiling — on weak or lost links. Link quality comes from direct-message ACK SNR and, for channel messages (no ACK), from hearing a repeater rebroadcast your packet. The radio page / name bar shows the live power. Default OFF (fixed TX power). **Suppressed (shown as `--`) while the repeater is on** — a repeater holds full TX power for consistent relay reach; your setting is restored when the repeater is switched off. |
 
 |           OLED            |           E-Ink           |
@@ -90,6 +90,7 @@ The **repeater** mode and its flood filters live on their own screen — see **T
 | Name        | keyboard entry (up to 31 chars)                     | This device's node name, shown to others and in every advert. **Enter** opens the keyboard pre-filled with the current name; applied and saved on submit |
 | Timezone    | −12 h … +14 h                                       | UTC offset in whole hours                                                              |
 | Low battery | off / 3.0 V / 3.1 V / 3.2 V / 3.3 V / 3.4 V / 3.5 V | Auto-shutdown threshold; also sets the 0 % anchor for the battery percentage indicator |
+| GPS pwr _(if GPS detected)_ | off / 1 min / 5 min / 15 min / 30 min / 1 h | **Battery saver.** Cycles GPS off between fixes instead of running it continuously; each wake waits for a fix (up to 60 s) before sleeping again for the chosen interval. Automatically stays continuously on regardless of this setting whenever something needs a live position — an active Trail recording, Map › Live share, an armed Locator, or the Compass / Nearby navigate view. `off` (default) matches earlier releases: GPS runs continuously whenever enabled. The GPS status icon blinks while napping between fixes. |
 | Units       | Metric / Imperial                                   | Global unit system for every distance/speed shown in Tools (Nearby Nodes, Trail, navigate-to-point). Metric: m / km, km/h, min/km. Imperial: ft / mi, mph, min/mi |
 | Reboot      | action (**Enter**)                                  | Restarts this device. Pending setting changes are saved first. Last row, so it isn't the default-selected one |
 

docs/solo_features/tools_screen/tools_screen.md

@@ -494,8 +494,9 @@ A circular tab carousel of live device and mesh stats, refreshed once a second (
 | Pool free    | Free entries in the packet pool                                                                     |
 | Queue        | Packets waiting in the outbound queue                                                               |
 | Errors       | Radio error flags since boot/reset — `OK`, or tokens `F` (queue full), `C` (CAD timeout), `R` (RX-start timeout) |
+| RXPS wd s/h  | RX duty-cycle watchdog recovery count, `soft/hard` — how many times the background watchdog has re-armed (soft) or fully reset (hard) a stuck duty-cycle sequencer. Stays `0/0` unless Settings › Radio › **Pwr save** is on and something actually went wrong. |
 
-The packet counters, **Forwarded** and **Errors** are cumulative since boot. On the **Live** tab, **Hold Enter** opens a one-item *Reset counters* menu (Back dismisses it); the live readings (noise, RSSI/SNR, pool, queue, uptime) are not affected. **Cancel/Back** returns to the Tools list.
+The packet counters, **Forwarded**, **Errors** and **RXPS wd s/h** are cumulative since boot. On the **Live** tab, **Hold Enter** opens a one-item *Reset counters* menu (Back dismisses it); the live readings (noise, RSSI/SNR, pool, queue, uptime) are not affected. **Cancel/Back** returns to the Tools list.
 
 The counters make the repeater behaviour observable: **Forwarded** confirms the node is actually relaying (not just configured to), and **Pool free** / **Queue** show whether forwarding is exhausting the packet pool. See **Tools › Repeater** for the relaying options.