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fix(types): make puppeteer-core an optional peer for Page typing (#83)

* fix(types): make puppeteer-core an optional peer for Page typing

@microlink/function and microlink.io declarations import Page and
HTTPResponse from puppeteer-core, which is only a devDependency, so a
TypeScript consumer without skipLibCheck failed with TS2307. The runtime
never loads puppeteer-core: user functions are serialized and run on
Microlink.

Ignore the unresolved import so Page and HTTPResponse fall back to any,
and declare puppeteer-core as an optional peer so consumers that install
it keep the real Puppeteer types, including under Yarn PnP strict mode,
where an undeclared package cannot be resolved at all.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(types): lock the any fallback and the optional peer

The type suite stayed green when puppeteer-core was always linked, and when the optional peer was removed. Call methods the real Page and HTTPResponse reject so a missing module must type them as any, and assert the peer.

Co-authored-by: Cursor <cursoragent@cursor.com>

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

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