chore(lint): enable typescript/unified-signatures

[HAYDEN-OAI]

• I understand that this repository is auto-generated and my pull request may not be merged

Changes being requested

• Remove the typescript/unified-signatures compatibility exception from oxlint.config.ts.
• Resolve the 2 existing handwritten-code diagnostics with focused, behavior-preserving cleanup.

Additional context & links

• Oxlint cleanup stack, part 60; stacked on chore(lint): enable unicorn/prefer-class-fields #2138.
• Preserves generated-file exclusions and repository-specific import policy.

Validation

• pnpm lint
• pnpm exec tsc --pretty false
• pnpm exec vitest run --config vitest.config.mts --update=none

Stack

#2129
#2130
#2131
#2132
#2133
#2134
#2135
#2136
#2137
#2138
#2139 👈 this PR
#2140
#2141

[jbeckwith-oai]

Reviewed exact head f92e883. Unifying the identical open/close listener overloads preserves the socket contract while making it more direct; the immediate stacked diff and CI are clean.

[openai-sdks]

OkTest Summary

✅ 237/237 SDK tests passed in 9.241s for Node SDK PR #2139.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	122ms
tests/chat-completions-create.test.ts	✅ Passed	207ms
tests/chat-completions-stream.test.ts	✅ Passed	178ms
tests/files-content-binary.test.ts	✅ Passed	134ms
tests/files-create-multipart.test.ts	✅ Passed	128ms
tests/files-list-pagination.test.ts	✅ Passed	165ms
tests/initialize-config.test.ts	✅ Passed	268ms
tests/instance-isolation.test.ts	✅ Passed	87ms
tests/models-list.test.ts	✅ Passed	121ms
tests/responses-background-lifecycle.test.ts	✅ Passed	157ms
tests/responses-body-method-errors.test.ts	✅ Passed	248ms
tests/responses-cancel-timeout.test.ts	✅ Passed	205ms
tests/responses-cancel.test.ts	✅ Passed	321ms
tests/responses-compact-retries.test.ts	✅ Passed	190ms
tests/responses-compact.test.ts	✅ Passed	171ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	98ms
tests/responses-create-advanced.test.ts	✅ Passed	121ms
tests/responses-create-disconnect.test.ts	✅ Passed	1.141s
tests/responses-create-errors.test.ts	✅ Passed	174ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	140ms
tests/responses-create-retries.test.ts	✅ Passed	277ms
tests/responses-create-stream-failures.test.ts	✅ Passed	160ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	2.141s
tests/responses-create-stream-wire.test.ts	✅ Passed	2.099s
tests/responses-create-stream.test.ts	✅ Passed	73ms
tests/responses-create-terminal-states.test.ts	✅ Passed	170ms
tests/responses-create-timeout.test.ts	✅ Passed	262ms
tests/responses-create.test.ts	✅ Passed	167ms
tests/responses-delete.test.ts	✅ Passed	152ms
tests/responses-input-items-errors.test.ts	✅ Passed	176ms
tests/responses-input-items-list.test.ts	✅ Passed	149ms
tests/responses-input-items-options.test.ts	✅ Passed	83ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	248ms
tests/responses-input-tokens-count.test.ts	✅ Passed	225ms
tests/responses-malformed-inputs.test.ts	✅ Passed	1.743s
tests/responses-not-found-errors.test.ts	✅ Passed	222ms
tests/responses-parse.test.ts	✅ Passed	141ms
tests/responses-retrieve-retries.test.ts	✅ Passed	199ms
tests/responses-retrieve.test.ts	✅ Passed	173ms
tests/responses-stored-method-errors.test.ts	✅ Passed	533ms
tests/retry-behavior.test.ts	✅ Passed	2.928s
tests/sdk-error-shape.test.ts	✅ Passed	223ms

View OkTest run #31227336386

_{SDK merge (db329a430f8d) · head (91929676afda) · base (da7b9f58272c) · OkTest (91635c6a2723)}