feat(api): make function call output call IDs optional

[apcha-oai]

Summary

Update the bundled API schema so call_id is optional in stable and beta function call output inputs and responses; input values also accept null.

[Copilot]

Pull request overview

Updates the bundled OpenAPI schema used by the CLI’s api_reference/ module to reflect an API contract change: call_id is no longer required for function tool call output objects (stable + beta), and request-side “output item” inputs may explicitly send call_id: null.

Changes:

• Remove call_id from the required list for stable FunctionToolCallOutput and beta BetaFunctionToolCallOutput.
• Update stable/beta *FunctionCallOutputItemParam schemas so call_id is optional and accepts string | null.
• Refresh Castiron generation metadata/hashes to match the updated transformed schema.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
api_reference/openapi.transformed.yml	Adjusts stable/beta function call output schemas to make call_id optional; input params also accept null.
.castiron.stats.yml	Updates generation IDs and spec/codegen hashes for the regenerated schema bundle.

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[github-actions]

Castiron custom code

✅ No new custom-code files detected.

5 mixed files remain; 0 existing customizations changed.

Compared f529fc24b560 → a299c58901de. Generated baselines verified.

5 existing customizations unchanged

• pkg/cmd/adminorganizationcertificate.go
• pkg/cmd/cmd.go
• scripts/castiron/README.md
• scripts/castiron/custom_code_report.py
• scripts/castiron/test_custom_code_report.py

A changed generated baseline means this report cannot reliably identify which handwritten lines changed.

Inspect the custom-code diff

Download the exact patch produced by this run (requires repository access):

gh run download 33022497220 --repo openai/openai-cli \
  --name castiron-custom-code-33022497220-1 --dir /tmp/castiron-custom-code-33022497220-1
git apply --stat /tmp/castiron-custom-code-33022497220-1/custom-code.patch
cat /tmp/castiron-custom-code-33022497220-1/custom-code.patch

Or reproduce it from an SDK checkout containing the vendored reporter:

git fetch --no-tags origin f529fc24b5607967e645f42eb547a0fa94ca8ff7 a299c58901dea38e646557ec67a531a59b2268b7
python3 scripts/castiron/custom_code_report.py report \
  --base f529fc24b5607967e645f42eb547a0fa94ca8ff7 \
  --head a299c58901dea38e646557ec67a531a59b2268b7 --fetch --require-head-hash --public \
  --out /tmp/castiron-custom-code-a299c58901de
cat /tmp/castiron-custom-code-a299c58901de/custom-code.patch

This is the current full custom patch for mixed files, not an attribution of only the handwritten lines changed by this PR.

Full report and patch

[jbeckwith-oai]

Verified this change only updates the transformed stable/beta OpenAPI schemas and Castiron generation metadata; optional response IDs and optional/nullable input IDs match the canonical API contract, with no CLI command/runtime compatibility changes. Looks good.