Rewrite CLAUDE.md and README.md
CLAUDE.md: replace bloated 850-line version with focused 230-line guide. Fix inaccuracies (module path, build dir, Connect RPC vs gRPC, buf vs protoc). Add detailed architecture with request flows, code generation workflow, rootfs update process, and two-module gotchas. README.md: add core deployment instructions (prerequisites, build, host setup, configuration, running, rootfs workflow).
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