[codex] Draft sbom-diff-and-risk v0.9.0 release notes

tools/sbom-diff-and-risk/RELEASE_NOTES_v0.9.0.md

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+# sbom-diff-and-risk v0.9.0
+
+`v0.9.0` is the policy JSON sidecar and consumer integration usability
+release.
+
+## Theme
+
+Policy-focused machine-readable output for CI consumers.
+
+`v0.9.0` focuses on making local policy outcomes easier to consume without
+walking the full JSON report. It adds a policy-only JSON sidecar, checked-in
+policy sidecar examples, and copyable GitHub Actions consumer guidance.
+
+This release keeps the dependency diff model, existing full-report JSON shape,
+Markdown output behavior, SARIF output behavior, release workflows, and
+publishing status unchanged except for the new optional CLI output surface.
+
+## Highlights
+
+- Added optional `--policy-json PATH` support to `sbom-diff-risk compare`.
+- Added a checked-in `examples/sample-policy.json` artifact for the policy
+  sidecar shape.
+- Added a GitHub Actions policy consumer example at
+  `examples/github-actions-policy-consumer.yml`.
+- Updated reviewer-facing evidence documentation for reproducing and consuming
+  `outputs/policy.json`.
+- Kept production PyPI intentionally deferred.
+
+## Policy JSON sidecar
+
+`--policy-json PATH` writes policy-related JSON sections from the same report
+model used by `--out-json`. It does not introduce a second policy schema.
+
+The sidecar includes:
+
+- `policy_evaluation`
+- `blocking_findings`
+- `warning_findings`
+- `suppressed_findings`
+- `rule_catalog`
+- `summary.policy` when policy evaluation is applied
+- provenance policy sections when those sections are relevant
+
+The sidecar intentionally omits full-report `components` and `risks`. Consumers
+that need the complete dependency diff should continue to use `--out-json`.
+
+When policy is not applied, the sidecar records
+`policy_evaluation.applied` as `false` and omits `summary.policy`.
+
+## Consumer integration examples
+
+`examples/sample-policy.json` is generated from the existing CycloneDX example
+pair with `examples/policy-strict.yml`. It is locked by tests and is expected to
+match the policy-related sections in the corresponding full policy-fail JSON
+report.
+
+`examples/github-actions-policy-consumer.yml` shows how a consumer repository
+can:
+
+- install from the GitHub Release wheel, not production PyPI
+- run `sbom-diff-risk compare` with `--policy-json`
+- keep `outputs/policy.json` as a CI artifact
+- upload evidence even when local policy fails
+- fail the job from `summary.policy`
+
+The example is documentation only. It is not a workflow for this repository and
+does not change this repository's GitHub Actions configuration.
+
+## Compatibility and boundaries
+
+- Existing `--out-json` behavior remains the full JSON report output.
+- Existing `--summary-json PATH` behavior remains summary-only output.
+- Existing Markdown output behavior is unchanged.
+- Existing SARIF output behavior is unchanged.
+- Existing policy pass, warn, and fail behavior is unchanged.
+- Existing exit codes are unchanged.
+- No hidden network behavior was added.
+- No CVE lookup or CVE resolution was added.
+- Policy findings remain local policy decisions, not dependency safety
+  verdicts.
+- Consumers should treat unrecognized future fields as additive report data.
+
+## Distribution status
+
+- Production PyPI publishing remains intentionally deferred.
+- This release is expected to be distributed through GitHub Release assets.
+- The consumer examples install from GitHub Release assets or local checkout,
+  not production PyPI.
+- This release does not publish to TestPyPI.
+- This release does not publish to production PyPI.
+- No production PyPI workflow is added.
+
+## Not in this release
+
+- No package safety verdicts.
+- No vulnerability scanning.
+- No CVE resolution.
+- No default network enrichment.
+- No workflow changes for this repository.
+- No TestPyPI publishing.
+- No production PyPI publishing.
+- No production PyPI workflow.
+
+This PR only drafts release notes. It does not bump package version, create a
+tag, create a GitHub Release, publish to PyPI/TestPyPI, or change runtime
+behavior.