# Completed Design Records

These documents preserve the rationale, delivery sequence, and verification
record for work that has been implemented or superseded. They are historical
records rather than active implementation instructions. For current extension
contracts, start with the maintainer guides under `docs/development/`, the active
design notes, and the executable runtime tests.

```{toctree}
:maxdepth: 1

architecture-upgrade-plan
api-buffer-source-sink
io-sink-runtime-api
reduce-dimensionality-uncertainty-estimators
chunked-processing-handoff
code-coherence
```