fix(api): add module metadata for api_reference package

[apcha-oai]

Summary

Add Go module declaration and a gitattributes entry for the api_reference package. These are metadata and formatting controls only and do not change any customer-visible SDK types, methods, or runtime behavior.

Changes

• Add Go module declaration for the api_reference package (module github.com/openai/openai-cli/api_reference).
• Add .gitattributes rule to treat openapi.transformed.yml with whitespace handling to control diffs/formatting.
• No changes to the public SDK surface, API contracts, or runtime behavior.

Internal pull request: https://github.com/openai/openai-cli-internal/pull/15

Validation

• Generated SDK changes were copied from the internal pull request.
• Public SDK CI runs against this draft pull request.

[Copilot]

Pull request overview

This PR promotes generated CLI SDK artifacts into the public repository, adding metadata and configuration needed to track and manage the generated API reference output.

Changes:

• Add a standalone Go module definition under api_reference/.
• Add .gitattributes configuration for the transformed OpenAPI spec file.
• Add Castiron generation metadata (.castiron.stats.yml) to record the generation inputs/outputs.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
api_reference/go.mod	Introduces a nested Go module for the api_reference subtree.
api_reference/.gitattributes	Configures Git attributes for openapi.transformed.yml within api_reference/.
.castiron.stats.yml	Records codegen provenance (schema/config hashes and codegen SHA).

Suppressed comments (1)

api_reference/go.mod:2

• api_reference/go.mod is missing a go directive. Without it, the module defaults to Go 1.16 semantics (e.g., different module graph pruning behavior) and go mod tidy will typically rewrite the file. The root go.mod already pins go 1.25.0, so aligning here avoids toolchain-dependent diffs.

module github.com/openai/openai-cli/api_reference

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 4 changed files in this pull request and generated no new comments.

Suppressed comments (2)

api_reference/go.mod:2

• This nested module’s go.mod is missing a go directive. Without it, the Go toolchain will assume legacy module semantics and go mod tidy on newer Go versions will typically add the directive anyway, creating avoidable churn. Align it with the repository’s Go version (see root go.mod:3).

module github.com/openai/openai-cli/api_reference

.castiron.stats.yml:3

• PR description says the changes are limited to the api_reference module declaration and .gitattributes, but this PR also adds .castiron.stats.yml. Please either mention this file in the PR description/change list or drop it from the PR if it’s not intended to be committed.

schema_version: 1
generation_id: 8980ba38-7734-42cc-a876-8da69c2888c3
openapi_spec_hash: d342651bd77c6cd6ea10a9d889b35bb8