fix: preserve generic Linux ffi lock entry

[jbeckwith-oai]

Summary

• record the generic ffi 1.17.2 variant selected by Ruby reporting x86_64-linux
• prevent Bundler 4.0.17 from mutating Gemfile.lock during Linux x86_64 installs
• preserve every existing lock platform and platform-specific ffi variant

Root cause

The lockfile contained the x86_64-linux-gnu and x86_64-linux-musl variants, but Ruby 4.0.6 reports Gem::Platform.local as x86_64-linux. Bundler 4.0.17 selects the generic source ffi variant for that platform and added the missing spec on every clean checkout.

Validation

• reproduced the original one-line drift with Ruby 4.0.6 and Bundler 4.0.17 on Linux x86_64
• ran bundle install and bundle check twice from a fresh fixed checkout; the lockfile checksum remained unchanged and Git stayed clean after both passes
• loaded FFI successfully as x86_64/linux
• preserved all eight existing lock platforms
• focused self-contained tests: 137 runs, 738 assertions, 0 failures or errors
• git diff --check

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[openai-sdks]

OkTest Summary

✅ 237/237 SDK tests passed in 8.597s for Ruby SDK PR #323.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	168ms
tests/chat-completions-create.test.ts	✅ Passed	239ms
tests/chat-completions-stream.test.ts	✅ Passed	128ms
tests/files-content-binary.test.ts	✅ Passed	213ms
tests/files-create-multipart.test.ts	✅ Passed	239ms
tests/files-list-pagination.test.ts	✅ Passed	174ms
tests/initialize-config.test.ts	✅ Passed	167ms
tests/instance-isolation.test.ts	✅ Passed	221ms
tests/models-list.test.ts	✅ Passed	199ms
tests/responses-background-lifecycle.test.ts	✅ Passed	219ms
tests/responses-body-method-errors.test.ts	✅ Passed	421ms
tests/responses-cancel-timeout.test.ts	✅ Passed	208ms
tests/responses-cancel.test.ts	✅ Passed	218ms
tests/responses-compact-retries.test.ts	✅ Passed	262ms
tests/responses-compact.test.ts	✅ Passed	214ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	136ms
tests/responses-create-advanced.test.ts	✅ Passed	199ms
tests/responses-create-disconnect.test.ts	✅ Passed	142ms
tests/responses-create-errors.test.ts	✅ Passed	221ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	128ms
tests/responses-create-retries.test.ts	✅ Passed	278ms
tests/responses-create-stream-failures.test.ts	✅ Passed	131ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	241ms
tests/responses-create-stream-wire.test.ts	✅ Passed	2.011s
tests/responses-create-stream.test.ts	✅ Passed	138ms
tests/responses-create-terminal-states.test.ts	✅ Passed	314ms
tests/responses-create-timeout.test.ts	✅ Passed	235ms
tests/responses-create.test.ts	✅ Passed	336ms
tests/responses-delete.test.ts	✅ Passed	332ms
tests/responses-input-items-errors.test.ts	✅ Passed	197ms
tests/responses-input-items-list.test.ts	✅ Passed	196ms
tests/responses-input-items-options.test.ts	✅ Passed	185ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	232ms
tests/responses-input-tokens-count.test.ts	✅ Passed	242ms
tests/responses-malformed-inputs.test.ts	✅ Passed	2.162s
tests/responses-not-found-errors.test.ts	✅ Passed	323ms
tests/responses-parse.test.ts	✅ Passed	172ms
tests/responses-retrieve-retries.test.ts	✅ Passed	270ms
tests/responses-retrieve.test.ts	✅ Passed	278ms
tests/responses-stored-method-errors.test.ts	✅ Passed	701ms
tests/retry-behavior.test.ts	✅ Passed	1.915s
tests/sdk-error-shape.test.ts	✅ Passed	330ms

View OkTest run #30666176338

_{SDK merge (3c9e96b34dc5) · head (b363beeca52a) · base (f40aef1892a4) · OkTest (91635c6a2723)}

[HAYDEN-OAI]

Verified that ffi 1.17.2 native variants exclude Ruby >= 3.5, so the generic spec is required for Ruby 4. Existing platforms/native variants and the published gem runtime dependency contract remain unchanged. No substantive issues found.