[codex] Sync docs after sbom-diff-and-risk v0.8.0 release

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Brief Design Summary

This PR syncs reviewer-facing documentation after the sbom-diff-and-risk v0.8.0 release.

It updates the repository landing README, reviewer brief, reviewer evidence pack, and consumer GitHub Actions examples so current-release wording, release notes links, release asset examples, and wheel install examples point at v0.8.0.

This is docs/example-only. It does not change runtime behavior, package metadata, workflows, release tags, GitHub Releases, PyPI/TestPyPI publishing, or production PyPI status.

Files Changed

• README.md
• tools/sbom-diff-and-risk/docs/reviewer-brief.md
• tools/sbom-diff-and-risk/docs/reviewer-evidence-pack.md
• tools/sbom-diff-and-risk/docs/github-actions-consumer-example.md
• tools/sbom-diff-and-risk/examples/github-actions-consumer.yml

Validation

• git diff --check passed.
• Confirmed touched current-release docs/examples no longer contain v0.7.0 / 0.7.0 references.
• Confirmed relative Markdown links resolve.
• Broad Unicode Cf/Cc scan found no non-tab/newline control or format characters.
• Confirmed package metadata and runtime version remain 0.8.0.
• Confirmed no workflow files changed and no production PyPI workflow exists.
• No Python tests run because this is docs/example-only.

Out of Scope

• No runtime behavior changes
• No CLI behavior changes
• No workflow changes
• No package version bump
• No tag or GitHub Release
• No PyPI/TestPyPI publishing
• No production PyPI workflow