Prepare v0.7.0 release

[bernalde]

Refs #26.

Summary

• Bump Project.toml to version = "0.7.0".
• Finalize the changelog section for v0.7.0 - 2026-06-12.

Release rationale

This is the first driver release in the benchmark-readiness release wave and is intended to be the reference template for the remaining drivers.

The merged implementation updates MQLib to the released benchmark-conformance stack:

• QUBODrivers = "0.6.1"
• QUBOTools = "0.13"
• benchmark metadata including backend, algorithm, reads, seeds, status, and timing;
• QUBODrivers.test(...; benchmark_conformance = true) in CI against released dependencies.

Validation

• julia --project=. -e 'using TOML; project = TOML.parsefile("Project.toml"); changelog = read("CHANGELOG.md", String); @assert project["version"] == "0.7.0"; @assert occursin("## v0.7.0 - 2026-06-12", changelog); @assert project["compat"]["QUBODrivers"] == "0.6.1"; println("release metadata check passed")'
• git diff --check
• julia --project=. -e 'using Pkg; Pkg.test()'
• bash test/native_c_api_smoke.sh

After merge

• Register v0.7.0 with JuliaRegistrator.
• Let TagBot create the tag/release after registration lands.
• Update Release wave (reference driver): QUBODrivers 0.6 / QUBOTools 0.13 compat + benchmark conformance #26 and the QUBO.jl epic once the release is registered.

[bernalde]

@JuliaRegistrator register branch=main

[JuliaRegistrator]

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