Persist Decodex X post for PR 27591

[yvette-carlisle]

Summary

• Add the PR 27591 social_post/v1 publication record for @decodexspace.
• Mark the matching social_publish_reservation/v1 record consumed.
• Record the live X URL, no-media caveat, duplicate checks, cap accounting, and final readback caveat.

Publication

• Candidate: openai-codex-pr-27591
• decision.worthiness: publish
• Mode: operator_impact
• X URL: https://x.com/decodexspace/status/2065373771834478939

Validation

• jq -e reservation/post schema and status checks
• cargo run -p decodex --bin decodex -- radar validate artifacts/github/social-candidates artifacts/social/x

Caveat

• X final readback auto-linked the dotted tool name skills.read; the artifact records this rendering caveat and the source link expands to the intended GitHub PR.