chore(api): Update generated file header text

[apcha-oai]

Summary

chore(api): Update generated file header text

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[openai-sdks]

OkTest Summary

✅ 237/237 SDK tests passed in 16.743s for Java SDK PR #846.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	776ms
tests/chat-completions-create.test.ts	✅ Passed	683ms
tests/chat-completions-stream.test.ts	✅ Passed	383ms
tests/files-content-binary.test.ts	✅ Passed	211ms
tests/files-create-multipart.test.ts	✅ Passed	233ms
tests/files-list-pagination.test.ts	✅ Passed	253ms
tests/initialize-config.test.ts	✅ Passed	163ms
tests/instance-isolation.test.ts	✅ Passed	164ms
tests/models-list.test.ts	✅ Passed	194ms
tests/responses-background-lifecycle.test.ts	✅ Passed	304ms
tests/responses-body-method-errors.test.ts	✅ Passed	537ms
tests/responses-cancel-timeout.test.ts	✅ Passed	258ms
tests/responses-cancel.test.ts	✅ Passed	331ms
tests/responses-compact-retries.test.ts	✅ Passed	511ms
tests/responses-compact.test.ts	✅ Passed	274ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	582ms
tests/responses-create-advanced.test.ts	✅ Passed	1.548s
tests/responses-create-disconnect.test.ts	✅ Passed	1.143s
tests/responses-create-errors.test.ts	✅ Passed	344ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	288ms
tests/responses-create-retries.test.ts	✅ Passed	271ms
tests/responses-create-stream-failures.test.ts	✅ Passed	265ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	281ms
tests/responses-create-stream-wire.test.ts	✅ Passed	6.276s
tests/responses-create-stream.test.ts	✅ Passed	143ms
tests/responses-create-terminal-states.test.ts	✅ Passed	472ms
tests/responses-create-timeout.test.ts	✅ Passed	296ms
tests/responses-create.test.ts	✅ Passed	232ms
tests/responses-delete.test.ts	✅ Passed	240ms
tests/responses-input-items-errors.test.ts	✅ Passed	313ms
tests/responses-input-items-list.test.ts	✅ Passed	400ms
tests/responses-input-items-options.test.ts	✅ Passed	592ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	276ms
tests/responses-input-tokens-count.test.ts	✅ Passed	371ms
tests/responses-malformed-inputs.test.ts	✅ Passed	5.078s
tests/responses-not-found-errors.test.ts	✅ Passed	448ms
tests/responses-parse.test.ts	✅ Passed	614ms
tests/responses-retrieve-retries.test.ts	✅ Passed	830ms
tests/responses-retrieve.test.ts	✅ Passed	238ms
tests/responses-stored-method-errors.test.ts	✅ Passed	969ms
tests/retry-behavior.test.ts	✅ Passed	3.409s
tests/sdk-error-shape.test.ts	✅ Passed	378ms

View OkTest run #31143855066

_{SDK merge (9029048e2cb2) · head (9929654783ec) · base (d01bea2058ac) · OkTest (91635c6a2723)}

[jbeckwith-oai]

The Castiron header replacement is clean across the generated Java/Kotlin files, but this regeneration contains an unrelated API-contract change in api_reference/openapi.transformed.yml: it removes minLength: 1 from both NamespaceToolParam.description and BetaNamespaceToolParam.description. The resulting fixture churn from "x" to "description" in four namespace-tool tests confirms that the generation semantics changed, rather than this being only header text. Please regenerate against the same input/transform behavior or restore those constraints so this PR is limited to the intended attribution update (plus generation metadata).