- Add Agent Companies manifest types for company, team, agent, project, task, and skill files
- Implement YAML frontmatter parsing, directory/tar.gz package parsing, and contextual parse errors
- Convert agent manifests to AgentCreateInput with role inference and skip-existing import support
- Export Agent Companies parser/type APIs from @fusion/core and add the yaml dependency
- Add comprehensive parser and type tests covering happy paths, archive handling, and validation failures
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