- data.flow: declare unit:'m3/h' (payloadSchema any) and drop the handler's own
convert() call — the registry now converts any number/string/{value,unit} to
m3/h before the handler. Handler reads the normalised scalar.
- Regenerate wiki topic-contract.
data.flow integration test green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>