Make distributed compilation work for OpenEmbedded/Yocto builds

.pre-commit-config.yaml

@@ -1,17 +1,56 @@
 repos:
--   repo: local
+  - repo: local
     hooks:
-    -   id: rust-linting
-        name: Rust linting
-        description: Run cargo fmt on files included in the commit.
+      # Format changed Rust files. Kept on nightly because the tree is
+      # nightly-formatted; stable fmt would reflow files needlessly.
+      - id: rust-fmt
+        name: cargo fmt
+        description: Format Rust sources included in the commit.
         entry: cargo +nightly fmt --
         pass_filenames: true
         types: [file, rust]
         language: system
-    -   id: rust-clippy
-        name: Rust clippy
-        description: Run cargo clippy on files included in the commit.
-        entry: cargo +nightly clippy --workspace --all-targets --all-features --
+
+      # Lint with the gate CI enforces (.github/workflows/ci.yml): -D warnings
+      # plus the three allows CI sets. --features all,dist-server so the
+      # feature-gated dist-client / dist-server code is actually linted - CI's
+      # clippy runs on default features and never covers it.
+      - id: rust-clippy
+        name: cargo clippy
+        description: Lint all targets with warnings denied.
+        entry: cargo clippy --locked --all-targets --features all,dist-server -- -D warnings -A unknown-lints -A clippy::type_complexity -A clippy::new-without-default
         pass_filenames: false
         types: [file, rust]
         language: system
+
+      # Compile every target including the integration-test harness. This is the
+      # gate that catches a changed function signature or struct literal under
+      # tests/ that plain `cargo check` and `makepkg` never compile.
+      - id: rust-check
+        name: cargo check --all-targets
+        description: Type-check every target, including tests and benches.
+        entry: cargo check --all-targets --features all,dist-server
+        pass_filenames: false
+        types: [file, rust]
+        language: system
+
+      # Run the CI test set on push (lib, bins, integration tests). On push, not
+      # per commit, so commit turnaround stays fast.
+      - id: rust-test
+        name: cargo test
+        description: Run the library, binary, and integration tests.
+        entry: cargo test --locked --features all,dist-server --lib --bins --tests
+        pass_filenames: false
+        types: [file, rust]
+        language: system
+        stages: [pre-push]
+
+      # RustSec advisory scan on push (org security standard).
+      - id: cargo-audit
+        name: cargo audit
+        description: Scan dependencies for known advisories.
+        entry: cargo audit
+        pass_filenames: false
+        types: [file, rust]
+        language: system
+        stages: [pre-push]

Cargo.toml

@@ -41,6 +41,7 @@ strip = true
 [dependencies]
 anyhow = { version = "1.0", features = ["backtrace"] }
 ar = "0.9"
+arc-swap = "1.7.1"
 async-trait = "0.1"
 backon = { version = "1", default-features = false, features = [
   "std-blocking-sleep",