[MO-Thibault]

Why

installGPTEventListeners and tryIdentifyFromParams accept optional arguments, and the README documents calling them with those arguments (README "GPT event listeners" and "Call tryIdentifyFromParams SDK API"). Their module augmentations declared them as () => void, so TypeScript consumers copying the documented calls get a compile error:

error TS2554: Expected 0 arguments, but got 1.   // sdk.installGPTEventListeners({ impressionViewable: [...] })
error TS2554: Expected 0 arguments, but got 2.   // sdk.tryIdentifyFromParams("email_md5", "c2")

JavaScript and script-tag users are unaffected (types only). Found while type-checking the product docs' examples against the SDK.

What Changed

• lib/addons/gpt.ts: installGPTEventListeners: (eventSpec?: GptEventSpec) => void, matching the implementation's signature.
• lib/addons/try-identify.ts: tryIdentifyFromParams: (key?: string, prefix?: string) => void, matching the implementation's signature.

How to Test

• pnpm build-lib, tsc -b browser, pnpm test (36 suites, 680 tests) and pnpm format all pass locally with no other changes.

• A TypeScript consumer calling both methods with and without arguments fails on master with the two errors above and compiles cleanly with this change.

• Tested

• Docs updated (not needed: no behavior change; the README already documents these arguments)

Notes

• Breaking change (no: argument lists only widen, all optional)
• Requires release (the fix reaches TypeScript users on the next published version; no urgency)

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