cap-go/capgo-skills

capacitor-plugin-upgrade-v8-to-v9

Upgrades a Capacitor plugin library from v8 to v9 (prerelease, @next until GA). Runs `npx @capacitor/plugin-migration-v8-to-v9@latest`, then the manual checklist - peer/dev dependency ranges, removed Android APIs (@NativePlugin, saveCall, pluginRequestPermission, int-code startActivityForResult, CapConfig getters, PluginCall.save/isSaved/hasOption), removed iOS APIs (CAPBridge class, getWebView, isSimulator, presentVC, CAPNotifications), AGP 9.2.1 / Gradle 9.5.1 build.gradle edits (compileSdk 37, minSdk 26, no targetSdk, built-in Kotlin, core-ktx to core, unique namespace, no jcenter, proguard-android-optimize.txt), iOS 16 in podspec and Package.swift, dropping the Cordova SPM product, and UIScene lifecycle observers. Use for "update my plugin to Capacitor 9", "Cannot find 'CAPBridge' in scope", NativePlugin compile errors, AGP 9 namespace collisions. Do not use for apps (use capacitor-app-upgrade-v8-to-v9), the 8.5 UIScene app step (use capacitor-uiscene-migration), or older majors.