Persist Decodex X publication for PR 26631

[yvette-carlisle]

Summary

• Add and consume a thin social_publish_reservation/v1 lease for the openai-codex-pr-26631 X Publisher candidate.
• Add the terminal social_post/v1 record for the live @decodexspace publication.

Publication

• Candidate: artifacts/github/social-candidates/openai-codex-pr-26631.json
• decision.worthiness: publish
• Mode: practical_explainer
• Published URL: https://x.com/decodexspace/status/2063923477699313782
• Media: none; text-only with GitHub PR card
• Cap day: 2026-06-08 Asia/Shanghai
• daily_count_before: 1
• daily_count_after: 2

Validation

• cargo run -p decodex --bin decodex -- radar validate artifacts/github/social-candidates artifacts/social/x

Evidence

• Chrome account/profile readback confirmed @decodexspace before reservation and compose.
• Live profile duplicate readback found no PR 26631 match before compose or immediately before click.
• Direct permalink readback showed the expected @decodexspace post text, GitHub PR card, and no image media.