chore(lint): enable no-fallthrough

[HAYDEN-OAI]

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

Changes being requested

• Remove the no-fallthrough 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 55; stacked on chore(lint): enable unicorn/prefer-regexp-test #2133.
• 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 👈 this PR
#2135
#2136
#2137
#2138
#2139
#2140
#2141

[jbeckwith-oai]

Reviewed exact head 6e9ed4c. Both no-fallthrough fixes make the existing no-op control flow explicit: nanoid now terminates after adding its pattern, and a non-null object literal returns the same accumulator before the unsupported-literal cases. No behavior, API, or maintainability regression found. The combined stack passes local lint, TypeScript 6 type-checking, and relevant vendor tests; this PR's CI is green.

[openai-sdks]

OkTest Summary

✅ 237/237 SDK tests passed in 10.142s for Node SDK PR #2134.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	178ms
tests/chat-completions-create.test.ts	✅ Passed	303ms
tests/chat-completions-stream.test.ts	✅ Passed	185ms
tests/files-content-binary.test.ts	✅ Passed	159ms
tests/files-create-multipart.test.ts	✅ Passed	130ms
tests/files-list-pagination.test.ts	✅ Passed	145ms
tests/initialize-config.test.ts	✅ Passed	162ms
tests/instance-isolation.test.ts	✅ Passed	102ms
tests/models-list.test.ts	✅ Passed	125ms
tests/responses-background-lifecycle.test.ts	✅ Passed	207ms
tests/responses-body-method-errors.test.ts	✅ Passed	314ms
tests/responses-cancel-timeout.test.ts	✅ Passed	192ms
tests/responses-cancel.test.ts	✅ Passed	244ms
tests/responses-compact-retries.test.ts	✅ Passed	235ms
tests/responses-compact.test.ts	✅ Passed	226ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	121ms
tests/responses-create-advanced.test.ts	✅ Passed	190ms
tests/responses-create-disconnect.test.ts	✅ Passed	1.129s
tests/responses-create-errors.test.ts	✅ Passed	196ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	180ms
tests/responses-create-retries.test.ts	✅ Passed	245ms
tests/responses-create-stream-failures.test.ts	✅ Passed	199ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	2.15s
tests/responses-create-stream-wire.test.ts	✅ Passed	2.455s
tests/responses-create-stream.test.ts	✅ Passed	77ms
tests/responses-create-terminal-states.test.ts	✅ Passed	211ms
tests/responses-create-timeout.test.ts	✅ Passed	221ms
tests/responses-create.test.ts	✅ Passed	149ms
tests/responses-delete.test.ts	✅ Passed	167ms
tests/responses-input-items-errors.test.ts	✅ Passed	163ms
tests/responses-input-items-list.test.ts	✅ Passed	180ms
tests/responses-input-items-options.test.ts	✅ Passed	111ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	215ms
tests/responses-input-tokens-count.test.ts	✅ Passed	202ms
tests/responses-malformed-inputs.test.ts	✅ Passed	2.121s
tests/responses-not-found-errors.test.ts	✅ Passed	258ms
tests/responses-parse.test.ts	✅ Passed	219ms
tests/responses-retrieve-retries.test.ts	✅ Passed	266ms
tests/responses-retrieve.test.ts	✅ Passed	220ms
tests/responses-stored-method-errors.test.ts	✅ Passed	548ms
tests/retry-behavior.test.ts	✅ Passed	3.029s
tests/sdk-error-shape.test.ts	✅ Passed	247ms

View OkTest run #31226071854

_{SDK merge (7f2df2f6305e) · head (b914b5601003) · base (68df5ae1c96b) · OkTest (91635c6a2723)}