Adds federation identity fields to town.json:
- Owner: email address for entity identity (defaults to git user.email)
- PublicName: public display name (defaults to town name)
Schema version bumped to 2. Existing town.json files remain compatible
as new fields are optional.
Also adds --owner and --public-name flags to 'gt install'.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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