Reserve Decodex X post for PR 27304

[yvette-carlisle]

Summary

• Adds a PR-visible social_publish_reservation/v1 for the openai-codex-pr-27304 X Publisher candidate.
• Consumes that reservation with a terminal social_post/v1 record after live Chrome publication.

Published Post

• Candidate: artifacts/github/social-candidates/openai-codex-pr-27304.json
• decision.worthiness: publish
• URL: https://x.com/decodexspace/status/2064920379634962433
• Media: text-only; non-release practical_explainer with direct GitHub PR card.

Evidence

• Account readback: Chrome switched from @hackink to @decodexspace and verified the account menu before reservation and compose.
• Duplicate readback: @decodexspace profile was readable before reservation and again after PR-visible reservation; both passes showed no PR27304, ToolExecutor, async_trait, ToolExecutorFuture, source URL, or commit-SHA duplicate.
• Open publication PR conflict check: PR Reserve Decodex X post for PR 26486 #298 is for openai-codex-pr-26486; no PR27304 pending record/reservation was found.
• Cap day: 2026-06-11 Asia/Shanghai, counted checked release-rollup post plus pending PR Reserve Decodex X post for PR 26486 #298 publication before posting; PR27304 records daily_count_before=2, after=3.
• Permalink readback confirmed @decodexspace, expected text, GitHub PR #27304 card, Automated by @hackink attribution, and no media/photo URL.

Validation

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