Adds --dry-run flag that shows what would be created without actually
creating the issue. Useful for scripting and validation.
- Shows preview in human-readable format by default
- Outputs full issue JSON with --json flag (empty ID, not placeholder string)
- Skips all side effects (hooks, labels, dependencies)
- Works with --rig/--prefix flags (shows target rig)
- Errors gracefully with --file flag (not supported)
- Includes event fields when --type=event
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