odcs 0.9.1

Reference implementation of the Open Data Contract Standard (ODCS)
Documentation 
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# Relationship to DTCS

ODCS and DTCS should mirror implementation architecture but remain conceptually separate.

```text
odcs
  data contracts
  what data is

dtcs
  transformation contracts
  how data changes

dpcs
  pipeline contracts
  how transformations compose
```

Shared design ideas:

- Rust core
- Canonical Object Model
- phase-based validation
- diagnostics
- CLI
- optional Python bindings

Avoid coupling the crates too early.
Shared utilities can be extracted later if duplication becomes painful.