CI poller resolver edit gate

Never edit a Publish issue unless resolve-ci-poller-input.js succeeds and emits a JSON object with a nonempty string .issueBody. Missing, scalar, malformed, non-string, or empty responses can appear usable after jq extraction yet make gh issue edit --body-file erase the canonical body. Require resolver success plus jq -e object/type/nonempty validation and a nonempty output file; otherwise warn, skip the issue, and clean every temporary file. Regression-test resolver failure, malformed JSON, scalar/non-string, missing, and empty bodies.