feat: add plugin updates and details

docs/plugin-development.md

@@ -42,6 +42,8 @@ styles.css (optional)
 
 GitHub plugins must use `./main.js` as `entry`, and `main.js` must be a single-file bundle without relative module imports. EdgeEver reads the default-branch manifest, locates the matching Release, downloads assets in parallel, verifies GitHub's SHA-256 digest when present, and caches the verified package in device-local IndexedDB. `main.js` is limited to 5 MB and `styles.css` to 1 MB.
 
+EdgeEver checks for updates when the Plugin Marketplace opens, when the window regains focus, and every 30 minutes, but never installs silently. The user must click Update and confirm. If a new version adds plugin permissions or network hosts, the confirmation lists the additional access. For GitHub distribution, the Release `manifest.json` must exactly match the default-branch manifest used for the update prompt or installation is rejected. Marketplace installs only follow newer versions verified in the Registry.
+
 Users can freely install without marketplace admission by pasting this into the standalone Plugin Marketplace page:
 
 ```text