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Clarify DNS64 routing, readiness, and prototype limits - #643

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feat/service-route-observabilityfrom
docs/dns64-prototype-routing
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scotwells wants to merge 1 commit into
feat/service-route-observabilityfrom
docs/dns64-prototype-routing

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Document how the DNS64 prototype uses internal service resources, node-local bidirectional routing, and routing metrics and logs. Clarify cleanup and rollback limits and the planned readiness agreement between the resolver VIP, Galactic route, and shared NAT64 prefix. Keep the product diagrams unchanged.

The document describes the current prototype and its limitations. It explicitly states that cross-node routing and health-based withdrawal are not implemented and production DNS64/NAT64 packet-path validation is incomplete. The prototype is not production-ready.

Validation: Markdown lint, reference/local-link checks, git diff --check, and go test ./internal/serviceroute pass. task ci stops during eBPF generation because llvm-strip is missing locally.

Related: Galactic routing #634, Galactic observability #635, Network API #27.

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