- Avoided value-imports of `puppeteer-core` in main startup files to prevent eager loading of the browser-data dependency graph.
- Used `import type` and literal string checks to defer `puppeteer-core` initialization until browser tools are actually invoked.
- Added a test to verify that `puppeteer-core` and `@puppeteer/browsers` remain off the eager startup import graph.
- Externalized additional heavy dependencies to reduce bundle size and improved minification settings in the build script.
- Removed export leakage by demoting many helper and const symbols to module-local scope.
- Renamed underscore-prefixed internals and cache fields, then updated related references and `satisfies never` checks.
- Deleted obsolete logic branches and helpers, including harmony-stream interruption flow and unused benchmark runtime helpers.
- Updated Biome config and manifests by broadening lint coverage and removing an unused `@napi-rs/cli` dev dependency.
- Adjusted tests and utilities to use renamed test helpers and remove redundant private test-only helpers/locals.
- Removed legacy actions and reworked tool schema to open/run/close with required open-before-run async-JS flow.
- Added named tab reuse with browser-kind checks and close options all/kill with ref-counted disposal.
- Implemented launch/CDP hardening by finding free ports, reusing live targets, waiting for readiness, and killing process trees.
- Added readable result extraction, selector and action visibility checks, and screenshot/observation support in run execution.
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