Release v2.14.0

What's Changed

• fix(deps): update form-data and remove unused axios by @Joouis in #240
• docs: design OpenAI Responses web search by @Joouis in #242
• feat(openai): add Responses web search by @Joouis in #243
• docs: design Codex standalone web search by @Joouis in #244
• feat(codex): add standalone web search compatibility by @Joouis in #247
• fix(openai): preserve parallel tool replay by @Jiahui-Gu in #248
• fix(gemini): keep SSE heartbeats invisible to SDK consumers by @Joouis in #249
• fix(openai): keep Responses streams alive for Codex by @Joouis in #250
• fix(gemini): scope resumed tool result deduplication to call turns by @Joouis in #251
• fix(proxy): normalize tool histories across API adapters by @Joouis in #252
• docs: consolidate guides and correct compatibility claims by @Joouis in #253
• fix(search): support anonymous standalone search filters by @Joouis in #254

Full Changelog: v2.13.0...v2.14.0