Fix README Installation: document mitre/atomic, not the AtomicCaldera fork#64

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fix/readme-installation-instructions

May 20, 2026

Commits on May 20, 2026

Fix Installation section: document mitre/atomic plugin, not the AtomicCaldera fork

deacon-mp
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claude
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Merge remote-tracking branch 'origin/master' into fix/readme-installation-instructions
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