Record Codex alpha.8 checkpoint defer

[yvette-carlisle]

Summary

• Refresh release_delta/v1 to latest observed OpenAI Codex prerelease rust-v0.140.0-alpha.8.
• Add a terminal social_candidate/v1 defer record for rust-v0.140.0-alpha.8.
• Preserve adjacent prerelease lineage as rust-v0.140.0-alpha.7 -> rust-v0.140.0-alpha.8 and list the exact upstream-analysis PR gaps.

Decision

• Mode: watch_note
• Worthiness: defer
• Reason: needs_upstream_analysis; the alpha.8 release body is sparse and the adjacent compare has unreviewed PR-title gaps.
• No X publication is requested from this automation.

Evidence

• Official Codex changelog latest readback: 2026-06-09 app/mobile/CLI entries; no official alpha.8 changelog entry observed.
• GitHub release metadata: rust-v0.140.0-alpha.8, published 2026-06-11T06:12:14Z.
• GitHub compare metadata: rust-v0.140.0-alpha.7...rust-v0.140.0-alpha.8, 21 commits, 20 PR-title refs.
• Checked Radar review/impact artifacts: none for the 20 alpha.8 PR refs.

Validation

• jq empty artifacts/github/social-candidates/openai-codex-rust-v0-140-0-alpha-8-needs-upstream-analysis.json site/src/content/release-deltas/openai-codex-latest.json
• git diff --check
• cargo make check-site-content -> OK (357 Radar artifact JSON files validated)