chore: add a top-level changelog

[pauldambra]

a user reported there was no changelog... because they didn't know to dig into the package structure...

totally fair!

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Jun 25, 2025 0:34am

[greptile-apps]

PR Summary

Added a top-level CHANGELOG.md file to improve discoverability of package changelogs, addressing user feedback about changelog visibility in the monorepo structure.

• Added root CHANGELOG.md to direct users to the detailed changelog in packages/browser/CHANGELOG.md

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[github-actions]

Download bundle size visualization

[github-actions]

Size Change: 0 B

Total Size: 3.56 MB

ℹ️ View Unchanged

Filename	Size
packages/browser/dist/all-external-dependencies.js	220 kB
packages/browser/dist/array.full.es5.js	306 kB
packages/browser/dist/array.full.js	371 kB
packages/browser/dist/array.full.no-external.js	388 kB
packages/browser/dist/array.js	171 kB
packages/browser/dist/array.no-external.js	186 kB
packages/browser/dist/customizations.full.js	15.9 kB
packages/browser/dist/dead-clicks-autocapture.js	12.6 kB
packages/browser/dist/exception-autocapture.js	9.55 kB
packages/browser/dist/external-scripts-loader.js	2.57 kB
packages/browser/dist/main.js	172 kB
packages/browser/dist/module.full.js	371 kB
packages/browser/dist/module.full.no-external.js	388 kB
packages/browser/dist/module.js	171 kB
packages/browser/dist/module.no-external.js	186 kB
packages/browser/dist/posthog-recorder.js	207 kB
packages/browser/dist/recorder-v2.js	113 kB
packages/browser/dist/recorder.js	113 kB
packages/browser/dist/surveys-preview.js	70.7 kB
packages/browser/dist/surveys.js	78.8 kB
packages/browser/dist/tracing-headers.js	1.63 kB
packages/browser/dist/web-vitals.js	10.4 kB

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