Add TopicSplit — free offline semantic text grouper

TopicSplit

https://github.com/andrwspt/topicsplit

A tiny, offline tool that groups pasted text into topic segments by lexical cohesion — no server, no API key, no tracking.

Why it belongs here

• 100% client-side — your text never leaves your browser
• No account, no tracking, no analytics
• Open source (MIT)
• Works offline

Category suggestion

Notes and Tasks → Text Organization (or similar)

Live demo

https://andrwspt.github.io/topicsplit/

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If this fits the list, I'm happy to open a PR with the proper formatting.