Include size details in README

[offyotto]

Added size information for Core-Monitor installers.

Change

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• Tests cover the changed behavior.
• User-facing changes are documented.
• Security-sensitive changes were reviewed for privilege, XPC, signing, and SMC impact.

[gitar-bot]

Code Review ✅ Approved

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Documentation update adding size details for Core-Monitor installers. No issues found.

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