docs: document LEANN_EMBEDDING_SERVER_HOST - #412
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#404 changed the HNSW and DiskANN embedding servers to bind 127.0.0.1 instead of every interface, and added LEANN_EMBEDDING_SERVER_HOST as the escape hatch. The variable was never documented, so a container or cross-host deployment breaks on upgrade with no discoverable way to restore the old behaviour. Documents the default, the override, and why widening it deserves care — the ZMQ REP protocol is unauthenticated, so reachability is authorisation. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Follow-up to #404.
That PR changed the HNSW and DiskANN embedding servers to bind
127.0.0.1instead oftcp://*, and addedLEANN_EMBEDDING_SERVER_HOSTas the escape hatch. The variable was never documented —grep -rn LEANN_EMBEDDING_SERVER_HOST --include="*.md"returned nothing — so a container or cross-host deployment breaks on upgrade with no discoverable way to restore the previous behaviour.Adds an Embedding Server Bind Address section to the configuration guide covering:
0.0.0.0, a specific interface, IPv6 — brackets handled automatically by fix: bind ZMQ embedding servers to loopback by default #404)Docs only, no code changes.
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