feat(sqlite-vec): vector search#285
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Add react-native-nitro-sqlite-vec: a companion package vendoring the sqlite-vec v0.1.9 amalgamation. Its native sources compile INTO the core react-native-nitro-sqlite library's single sqlite3 build and register via sqlite3_auto_extension — no second sqlite3, no runtime extension loading. Vector search runs through the core's existing execute() API (vec0 + vec_* functions); thin typed helpers (vecVersion/createVectorTable/ knnSearch) are included. Core integration: - Android: CMakeLists/build.gradle flag-gated compilation of the companion's sqlite-vec.c (-DSQLITE_CORE -DSQLITE_VEC_STATIC), enabled in the example via gradle.properties `nitroSqliteVec=true`. - iOS: companion RNNitroSqliteVec.podspec, static-linked into the core's single sqlite3 through the core podspec. - operations.cpp registers the extension once in sqliteOpenDb (#ifdef NITRO_SQLITE_VEC); bindStatement binds whole-number JS values as INTEGER (vec0 rowid/pk/partition require INTEGER); sqliteExecuteBatch fixes a double-rollback that masked the real batch error. Testing: on-device React Native Harness spec (example/tests/harness/sqlite-vec.harness.ts) covering vec_* scalar functions, distance metrics, vec0 KNN (float32/int8/bit), metadata filtering, partition keys, auxiliary columns, and UPDATE/DELETE.
riteshshukla04
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