Xcode 16+/26 no longer writes IDEProvisioningTeams to the preferences
plist, breaking ios-team-id.sh for newly signed-in accounts. Add
provisioning profile fallback and actionable error when an account
exists but no team ID can be resolved. Also replace ntohl() with
UInt32(bigEndian:) for Swift 6 compatibility and gitignore Xcode
build output directories.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>