feat(release): publish verified SemVer images

[codeh007]

实现首个标准 SemVer release 入口：

• Cargo package version 改为 0.1.0-rc.1
• tag-only release workflow 调用可复用只读 CI
• publish job 只推送同一 run 已验证的 OCI archive
• 生成 GitHub Release assets、SPDX SBOM、provenance 和标准 attestation
• prerelease 明确不更新 latest

本 PR 本身仅运行只读 CI；合并后仍需显式不可变 tag 才会发布。

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 79556bb4-95d4-41b6-bc73-572fc03317d1

📥 Commits

Reviewing files that changed from the base of the PR and between a60f1f8 and 6ddb149.

📒 Files selected for processing (4)

• .github/workflows/release.yml
• Cargo.toml
• openspec/changes/extract-and-standardize-pggomtm/tasks.md
• tests/image-readiness.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch semver-release

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