docs: remove dependency notes section from README

[devin-ai-integration]

Summary

Remove the "Dependency notes" section from README.md (the preact/@preact/signals peer-dependency note for Schedule-X).

Link to Devin session: https://app.devin.ai/sessions/c64519508c034ff78cfbdd2b6c217bbd
Requested by: @rchalamala

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[devin-ai-integration]

Devin Review found 1 potential issue.

[devin-ai-integration]

🚩 Removing documentation guard for non-obvious peer dependencies

The deleted section explicitly warned maintainers that preact and @preact/signals are peer dependencies of @schedule-x/* and must not be removed, despite never appearing in src/ imports. These dependencies are still present in package.json:12,21 and are required at runtime by @schedule-x/calendar (confirmed in package-lock.json:2931-2932). Without this note, a future contributor running a dependency audit or cleanup could reasonably conclude these are unused and remove them, breaking the Schedule-X calendar in src/Planner.tsx. Consider keeping this note somewhere (e.g., as a comment in package.json or in a contributing guide) if the README isn't the right place.

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[devin-ai-integration]

This removal was explicitly requested by the repo owner.

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