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Previously, nodes with empty filter rules (e.g., tagged servers that are only destinations, never sources) were skipped entirely in BuildPeerMap. This could cause visibility issues when using autogroup:self with multiple user groups. Remove the len(filter) == 0 skip condition so all nodes are included in nodeMatchers. Empty filters result in empty matchers where CanAccess() returns false, but the node still needs to be in the map so symmetric visibility works correctly: if node A can access node B, both should see each other regardless of B's filter rules. Add comprehensive tests for: - Multi-group scenarios where autogroup:self is used by privileged users - Nodes with empty filters remaining visible to authorized peers - Combined access rules (autogroup:self + tags in same rule) Updates #2990