Simplify key management for a plug-and-play demo#6

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JL2718 wants to merge 9 commits intovisa:mainfrom

Commits on Dec 18, 2025

feat: Add script for RSA and Ed25519 key generation
jL2718
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switch to PEM files instead of environment variables
jL2718
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split up agent_app components
jL2718
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moved key generation script to top-level
jL2718
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remove keys from .env example
jL2718
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added generated keys to registry sample data populator
jL2718
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tell users to populate registry
jL2718
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ignore keys
jL2718
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fix agent-registry start command
jL2718
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