Enhance akill + ikill, update dependency checks, update readme

[IGPenguin]

🎉 What's new?

From luispinho (PR #230, incorporated and improved):

• akill -n and ikill -n - kill an app without relaunching it
• ikill -s -n and all flag order combinations work
• ikill multi-device relaunch fixed (missing --udid on go-ios launch)

New additions on top:

• ikill now calls ios_check_developer_image before killing - catches Developer Mode being off and gives instructions;
  auto-restarts the go-ios tunnel on DTX failure and retries before giving up
• irecord no longer leaks raw ffmpeg shutdown noise or bash "Terminated" job messages
• isimulator detects xcode-select misconfiguration (Xcode installed but simctl not accessible) and offers sudo
  xcode-select -s /Applications/Xcode.app automatically
• aemulator uses emulator -list-avds instead of avdmanager (more reliable)
• adb auto-detected from $ANDROID_HOME when not in $PATH
• CLAUDE.md - project instructions for AI-assisted development
• README.md - typo sweep, corrected PATH export syntax, Developer Mode setup step in iOS installation

Infrastructure added to common_tools:

• ios_exec_dtx - generic wrapper for any go-ios command needing DTX/instruments; handles tunnel restart + retry
• ios_restart_tunnel - extracted tunnel start logic, reusable
• check_simctl_dependency - mirrors check_adb_dependency pattern for Xcode/simctl

⚠️ Progress checklist

• 🏗 Features fully completed
• 🔬 Shellcheck issues resolved
• 🔨 All changes tested
• 💬 Terminal output satisfactory
• 👀 Diff examined thoroughly
• 📝 API changes included in README.md
• 📣 Major changes listed in changelog.txt

[IGPenguin]

Yo @Franceskoooo, I followed up on your #231, there were few loose ends. All should be good now. 🙏

Can you pls test some iOS commands (like ikill) with multiple devices to ensure multi-device handling still works?

Thanks for your contribution again! ❤️