Add a Runbook for Configuring iOS Local Signing

[maugauwi-hash]

Labels: documentation, ios, devops
Priority: Low
Estimated Time: 30 minutes

Description:
ios/EthosProtocol/project.yml leaves DEVELOPMENT_TEAM: "" blank with a TODO(team) comment
instructing contributors to "set your Apple Developer Team ID before building/archiving," but there
is no accompanying document describing where to find that ID, how to configure it without
committing a personal value, or how CI (which builds successfully today without one, per
ios-ci.yml, since it only builds for the Simulator) differs from a real device/archive build that
would need it.

Tasks:

• Add a short runbook (e.g., docs/ios-local-signing.md) covering: finding a Team ID, setting it locally without committing it (e.g., via an untracked .xcconfig override), and why CI doesn't need one today
• Link it from the project.yml comment and the root README.md
• Note explicitly what would need to change here if/when a real device or TestFlight build is added to CI

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