Add FastAPI runtime with live event stream and demo controls

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e-man07yesterday

Claude-Session: https://claude.ai/code/session_011Y8k9njkcaQvD2JzKdpab3 Entire-Checkpoint: 01M4KS1PB0FFH4JWXP5Z0EMNBE

Checkpoints

AI-Powered On-Call Agent System Development

Claude CodeSonnet 5.5
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Checkpoint 1