feat(proximity): add native TurboQuant accelerator

.github/workflows/proximity-required.yml

@@ -0,0 +1,65 @@
+name: Proximity required
+
+on:
+  pull_request:
+    paths:
+      - "Cargo.toml"
+      - "Cargo.lock"
+      - "src/prolly/proximity/**"
+      - "tests/proximity*"
+      - "benches/prolly_proximity_bench.rs"
+      - "conformance/proximity-fixtures.json"
+      - "fuzz/**"
+      - "scripts/*turboquant*"
+      - "docs/proximity*"
+      - ".github/workflows/proximity-required.yml"
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  core:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo fmt --all -- --check
+      # Rust 1.98 promoted this MSRV-incompatible migration to warn-by-default.
+      # Keep the repository's reviewed chunks_exact parsing until it is
+      # migrated independently of the proximity release.
+      - run: >-
+          cargo clippy --all-targets --all-features --
+          -D warnings -A clippy::chunks-exact-to-as-chunks
+      - run: cargo test --all-features --test proximity_api --test proximity_metrics
+      - run: >-
+          cargo test --all-features
+          --test proximity_wire
+          --test proximity_search
+          --test proximity_async
+          --test proximity_composite
+          --test proximity_content_graph
+          --test proximity_proofs
+          --test proximity_turboquant
+
+  turboquant-fuzz-smoke:
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rustfmt
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo install cargo-fuzz --version 0.13.2 --locked
+      - run: cargo fmt --manifest-path fuzz/Cargo.toml -- --check
+      - run: >-
+          cargo fuzz run proximity_turboquant_decode --
+          -runs=2048 -max_len=4096 -timeout=5
+      - run: >-
+          cargo fuzz run proximity_turboquant_lifecycle --
+          -runs=256 -max_len=1024 -timeout=5

.gitignore

@@ -230,6 +230,7 @@ bindings/swift/Package.resolved
 !bindings/uniffi/Cargo.lock
 stores/prolly-store-*/Cargo.lock
 !stores/prolly-store-dynamodb/Cargo.lock
+!stores/prolly-store-slatedb/Cargo.lock
 
 # These are backup files generated by rustfmt
 **/*.rs.bk

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 ## Unreleased
 
+- Add a native, source-bound TurboQuant-MSE proximity accelerator with
+  deterministic structured rotation, fixed two/three/four-bit Lloyd-Max
+  codebooks, authoritative reranking, SIMD scoring, async/catalog/composite/
+  proof/content-graph integration, and maintained binding APIs. TurboQuant is
+  explicit-only until its checked-in recall and comparative performance gates
+  pass; it has no Turbovec dependency or wire compatibility.
+
 ## 0.7.2 — 2026-08-21
 
 - Add native `AsyncProlly::indexed_map(...).await` support with asynchronous