feat: add HGraphDiskANNLoader for converting DiskANN index to HGraph#1690

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inabao wants to merge 3 commits intomainfrom

Commits on Apr 3, 2026

feat: add HGraphDiskANNLoader for converting DiskANN index to HGraph

inabao
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claude
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refactor(hgraph): remove test-only methods and expose members for HGraphDiskANNLoader
inabao
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fix(factory): resolve merge conflict in engine.cpp
inabao
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