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Domain: typed DAG nodes, edges, runs, and events #4
Description
Implement typed Rust domain models matching the DAGOS contracts.
Node types: task, artifact, observation, decision, result, conversation.
Edge types: depends_on, produces, observed_from, related_to, supersedes.
Acceptance criteria:
- Serialization is deterministic JSON.
- Invalid enum values are rejected.
- IDs and timestamps have explicit types/validation.
Depends on: #2
Activity
domain: typed IDs, timestamps, DAG nodes/edges, runs, events, context