Fix high CPU usage caused by watch::Receiver clone inside loop #45
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The request_handler was cloning state.waiter inside the loop on each iteration. Since the source receiver never updates its "seen version", each clone immediately sees the current value as "new", causing changed() to return instantly and creating a hot loop (150%+ CPU).
Fix: Clone the receiver once before the loop, matching the correct pattern already used in dud_proxy_loop.
Also adds CLAUDE.md with project documentation for Claude Code.
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