DO NOT MERGE — POC: entity-level routing with composite tablet keys and TabletIndex#9590

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mlwelles wants to merge 21 commits intosharding-pocfrom

entity-extended-sharding-poc

Commits on Feb 4, 2026

chore: add .osgrep to .gitignore
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refactor(sharding): introduce IsLabeled() helpers for protobuf types
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docs: add entity-level sub-tablet routing design
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docs: add entity-level sub-tablet routing implementation plan
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feat(sharding): add TabletKey/ParseTabletKey composite key helpers
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feat(sharding): add ServingSubTablet and ServingTablets to Zero state machine
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feat(sharding): update handleTablet to use composite sub-tablet keys
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feat(sharding): register dgraph.label as pre-defined reserved predicate
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feat(sharding): add entity label cache for UID -> label lookups
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feat(sharding): two-phase entity-label-aware mutation routing in populateMutationMap
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feat(sharding): add AllSubTablets for query fan-out lookup
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feat(sharding): query fan-out across sub-tablets in ProcessTaskOverNetwork
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feat(sharding): sort fan-out across sub-tablets in SortOverNetwork
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test(sharding): add entity-level routing integration test
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feat(sharding): implement group-1 read for entity label cache miss
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feat(sharding): clear entity label cache on DropAll
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fix(sharding): sort merged UIDs and fix tablet cache for entity-level routing
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