Release engineering-workflow 0.8.2

[xeonvs]

Summary

• stop empty compatibility archive directories from producing false index_missing errors
• preserve fail-closed checks for non-empty, unmanaged, and symbolic archive indexes
• publish the deterministic Codex/Claude marketplace package as 0.8.2

Validation

• repository validator before and after 216 tests (1 platform-dependent skip)
• deterministic marketplace package check
• skill/plugin and strict Claude validators
• public-tree privacy scan and fully redacted Gitleaks tree/history scans
• git diff --check

Closes #5