- Add OrgTreeNode recursive type in core types and export it from the package index
- Add AgentStore.getChainOfCommand() with cycle protection and bounded traversal depth
- Add AgentStore.getOrgTree() to build sorted root/child hierarchies from reportsTo relationships
- Add AgentStore.resolveAgent() to resolve agents by exact ID or normalized shortname
- Add comprehensive AgentStore tests covering hierarchy traversal, tree construction, and shortname resolution
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