[codex] merge reborn OpenAI Responses branch into main

[ilblackdragon]

Summary

• Records codex/reborn-openai-responses as merged into main with an ancestry-only merge commit.
• Preserves the current main tree exactly; the merge resolved to no file changes after dropping duplicated branch-side changes.

Context

A direct push to main was rejected by repository rules requiring pull requests and the merge queue, so this branch carries the merge commit for the normal PR path.

PR #5370 was merged into codex/reborn-openai-responses after the original Responses PR landed, but its five-file WebUI v2 Node-tooling patch was already replayed onto main by PR #5384. git cherry marks the #5370 patch as already equivalent on main, so this PR only records the ancestry relationship and does not reapply those file changes.

Validation

• git merge-tree --write-tree main codex/reborn-openai-responses identified one conflict before the actual merge.
• Resolved the conflict by retaining current main external-tool validation guards while preserving the branch's structured Responses input payload helpers.
• git diff --check
• git diff --stat HEAD^1 HEAD returned empty, confirming no tree diff from current main.
• git cherry -v main origin/codex/reborn-openai-responses marks cb0887f8c / [codex] Pin WebUI v2 frontend Node tooling #5370 as already present on main by patch equivalence.

No behavior tests were run because the final merge commit is tree-identical to current main.

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

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