Reserve Decodex X post for PR 26639

[yvette-carlisle]

Summary

• Reserve and consume the @decodexspace publication attempt for openai/codex PR 26639.
• Persist the terminal social_post/v1 record for the live X post.
• Keep the reservation thin: lease, candidate refs, duplicate keys, cap inputs, and pre-compose evidence only.

Publication

• Published URL: https://x.com/decodexspace/status/2064286885279879399
• Candidate: artifacts/github/social-candidates/openai-codex-pr-26639.json
• Decision: decision.worthiness = publish, mode = operator_impact
• Media: text-only; non-release operator_impact post uses the GitHub PR card as the reader-value media surface.
• Cap: 2026-06-09 Asia/Shanghai daily count 7 -> 8.

Validation

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

Browser readback

• Chrome switched to and verified @decodexspace before compose.
• Profile/timeline duplicate readback before reservation and again after PR-visible reservation found no match for PR 26639, threadId, mcpServer/startupStatus/updated, subagent MCP failures, or the source URL.
• Permalink readback confirmed @decodexspace text, Automated by @hackink attribution, GitHub PR #26639 card, and no attached image.