Decisions

This chapter keeps short design notes that explain why the contract took its current shape.

These notes are part of the book, but they are not a higher authority than the behavioral chapters. If a decision note and a normative chapter appear to disagree, use the authority order in the book index.

Read:

1. Embedded cascade outbox
2. Native evolution and workspace materialization
3. Transcript anchoring
4. Thread head and lifecycle sagas
5. Codex as a second v1 harness
6. Rejected alternatives