feat: mcp sleep

main/boards/zhengchen-cam/custom-emojis/README.md

@@ -26,13 +26,28 @@ Recommended minimum set:
 - `sad`
 - `angry`
 
+Fatigue reminder:
+
+- Add `wakeup.gif` or `wakeup.png` to make the idle-fatigue reminder show a custom idol animation.
+- The reminder defaults to `wakeup` after 12 seconds of idle time or listening silence, then waits 60 seconds before it can trigger again.
+- Optional NVS settings in namespace `fatigue`:
+  - `enabled` (`bool`, default `true`)
+  - `idle_timeout_sec` (`int`, default `12`)
+  - `listening_timeout_sec` (`int`, default `12`)
+  - `cooldown_sec` (`int`, default `60`)
+  - `emotion` (`string`, default `wakeup`)
+  - `message` (`string`, default Chinese wake-up line)
+  - `sound_asset` (`string`, optional OGG filename in the assets partition)
+
 If an emotion-specific image is missing, the firmware falls back to `neutral`
 before using the built-in icon.
 
-For Zhengchen CAM boards, the build selects one subdirectory:
+For Zhengchen CAM boards, the build packages both subdirectories:
 
-- `CONFIG_ZHENGCHEN_CAM_USE_GIF_EMOJI=y`: use `gif/`
-- unset `CONFIG_ZHENGCHEN_CAM_USE_GIF_EMOJI`: use `png/`
+- Put static/default faces in `png/`, such as `png/neutral.png`.
+- Put animated/special actions in `gif/`, such as `gif/wakeup.gif`.
+- If both folders contain the same emotion name, PNG wins. For example,
+  `png/neutral.png` is used before `gif/neutral.gif`.
 
 After adding or replacing files, run a full flash so the assets partition is
 updated: