Parity validation between legacy message formats and canonical representations is incomplete. Without full parity coverage, there is limited confidence that adapter behavior matches real session data.
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# Task 03: Message Parity Harness
## Summary
Parity validation between legacy message formats and canonical representations is incomplete. Without full parity coverage, there is limited confidence that adapter behavior matches real session data.
## Context
`tests/unit/types/test_adapter.py` includes limited parity checks and round-trip coverage, but `tests/parity/test_message_parity.py` does not exist. There is no validation against real historical session artifacts.
## Related Docs
- [PLAN.md](../../PLAN.md)
- [Architecture Refactor Status Research](../../memory-bank/research/2026-01-25_architecture-refactor-status.md)
