feat: add local Ocean BQM parity report

[doomhammerhell]

Summary

Adds a reusable local Ocean BQM parity report for the D-Wave/Ocean boundary.

The report constructs a dimod.BinaryQuadraticModel when Ocean is available, preserves the canonical QUBO assignment domain including zero-bias isolated variables, and compares Noetheris energy against local BQM energy for supplied assignments.

The default path remains credential-free: when dimod is absent, the report records the missing optional dependency and leaves BQM data empty while local Noetheris replay remains valid.

Closes #2.

Validation

python3 -m pytest tests/test_optional_integrations.py tests/test_external_examples.py tests/test_qubo_exchange_parity.py
bash scripts/run_examples.sh
bash scripts/run_audit.sh

Local result: focused tests passed; bash scripts/run_audit.sh passed with 51 passed in pytest and Lean build successful.

Boundary

This PR only covers local dimod.BinaryQuadraticModel construction and energy parity. It does not submit to D-Wave cloud services, call samplers, perform embedding search, benchmark hardware, or introduce quantum advantage claims.