- Replace stub "Future: Federation" with comprehensive section
- Add Outpost interface and Worker interface definitions
- Document Cloud Run workers with persistent connections
- Document SSH/VM outposts for long-running work
- Add configuration example (outposts.yaml)
- Add architecture diagram showing outpost hierarchy
- Add Key Design Decision #14: Outpost Abstraction
Also reopened gt-u1j.6 and gt-u1j.12 (mail tasks) since beads
mail support (bd-kwro) is not yet complete.
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