aprender 0.31.2

Next-generation ML framework in pure Rust — `cargo install aprender` for the `apr` CLI
Documentation
<!-- PCU: examples-design-by-contract | contract: contracts/apr-page-examples-design-by-contract-v1.yaml -->
<!-- Example: cargo run -p aprender-core --example design_by_contract -->
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# Design by Contract

Demonstrates the three pillars of aprender's contract system:

1. **Tensor layout contract** -- shape validation for GGUF to APR conversion
2. **Block size constants** -- quantization format invariants
3. **Contract error handling** -- typed errors for violations

## Run

```bash
cargo run --example design_by_contract
```

## Source

```rust,ignore
// Run this example:
//   cargo run --example design_by_contract
//
// See the CLI reference and source code in crates/ for implementation details.
```