[MOD-14957] Add SQ8 support for tiered HNSW - #1029
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* SQ8 for Tired HNSW Index * Fix after rebase Don't recreate tiered hnsw backend index Make isInAccumulationPhase atomic Add SQAccumulationState Tiered hnsw fixes * Add transition tests * clean up * Address review * defered backend index init * clean up * fix lock
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Summary
Scope
This PR is limited to MOD-14957. Estimator policy, submit-callback failure handling, RediSearch integration, and SQ8 kernel work remain outside this change.
Verification
Run on
dorer-intelfrom an isolated temporary checkout:test_hnsw_sq8: 92/92 passedtest_hnsw: 310/310 passedConcurrentQueriesDuringNormalizationTransitionunder ThreadSanitizer: passed with no race reportsNo compilation or tests were run on the local development machine.