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feat(browserless): add report() hardware & GPU diagnostics (#810)

* feat(browserless): add report() hardware & GPU diagnostics

Add a `report()` context method that returns a normalized snapshot of the
environment a page renders in: browser build (name/version/headless/channel/
build + full and app-only launch args), virtualization/container detection,
OS/CPU/memory, and the GPU stack parsed from the ANGLE renderer string
(vendor/device/type, graphics API, mesa/llvm/simdWidth) plus per-version
WebGL capabilities/extensions and WebGPU support.

Optionally runs a small deterministic WebGL benchmark
(`report({ benchmark: true })`) for comparing environments and catching
render regressions after Chrome/Mesa/LLVM/flag/infra changes.

Includes TypeScript types (HardwareInfo) and tests.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* fix(browserless): don't mislabel branded Chrome as chrome-for-testing

detectBuild matched broad patterns (chrome-linux/mac/win, /chrome/) that also
hit stable Chrome install paths (/opt/google/chrome/chrome, Application/
chrome.exe). Match only the Chrome for Testing platform-arch dirs
(chrome-linux64, chrome-mac-arm64, chrome-win64, ...). Adds detectBuild unit
test. Addresses Cursor Bugbot review on #810.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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