Add a lint CI gate (fmt + clippy)

.github/workflows/ci.yml

@@ -24,6 +24,8 @@ jobs:
         uses: dtolnay/rust-toolchain@master
         with:
           toolchain: 1.98.1
+          # rustfmt/clippy are actually exercised in the sibling `lint.yml`
+          # workflow, not here — this job only needs the compiler.
           components: rustfmt, clippy
       - uses: Swatinem/rust-cache@v2
       - name: cargo check --workspace --all-targets

.github/workflows/lint.yml

@@ -0,0 +1,46 @@
+name: lint
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  format:
+    name: cargo fmt --check
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          # No `toolchain:` input — the action reads `rust-toolchain.toml`, so the
+          # pinned version lives in exactly ONE place.
+          components: rustfmt, clippy
+      - name: cargo fmt --all --check
+        run: cargo fmt --all --check
+
+  clippy:
+    name: cargo clippy -D warnings
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          # No `toolchain:` input — the action reads `rust-toolchain.toml`, so the
+          # pinned version lives in exactly ONE place.
+          components: rustfmt, clippy
+      - uses: Swatinem/rust-cache@v2
+      - name: cargo clippy --all-targets -- -D warnings
+        run: cargo clippy --all-targets -- -D warnings

crates/ogar-dismech/src/lib.rs

@@ -832,12 +832,12 @@ mod concept_id_collision_guard {
     #[test]
     fn stays_in_the_0x03_ontology_domain_clear_of_documented_bands() {
         assert_eq!(DISMECH_CONCEPT_ID >> 8, 0x03);
-        assert!(
+        const _: () = assert!(
             DISMECH_CONCEPT_ID > 0x0321,
             "must clear the documented private-consumer odd-stride run \
              (live through 0x031D, retired through 0x0321)"
         );
-        assert!(
+        const _: () = assert!(
             DISMECH_CONCEPT_ID < 0x0340,
             "must clear META_STUDY_SPINE (0x0340..=0x0347)"
         );