chore: hygiene config and MSRV check (OSS coherence residual)

.gitattributes

@@ -0,0 +1,26 @@
+# Normalise line endings to LF on commit, regardless of the contributor's
+# platform. Eliminates the noisy "LF will be replaced by CRLF" warnings
+# we accumulated while developing on Windows.
+
+* text=auto eol=lf
+
+# Binary files: leave them alone.
+*.png  binary
+*.jpg  binary
+*.jpeg binary
+*.gif  binary
+*.ico  binary
+*.wasm binary
+*.pdf  binary
+
+# Rust / TOML / YAML / Markdown explicitly LF.
+*.rs   text eol=lf
+*.toml text eol=lf
+*.yml  text eol=lf
+*.yaml text eol=lf
+*.md   text eol=lf
+*.json text eol=lf
+
+# Windows-only scripts keep CRLF endings so cmd.exe still runs them.
+*.bat  text eol=crlf
+*.cmd  text eol=crlf

.github/workflows/ci.yml

@@ -52,3 +52,16 @@ jobs:
         with:
           workspaces: "tools/ai-review -> tools/ai-review/target"
       - run: cargo test --workspace --all-features --no-fail-fast
+
+  msrv:
+    name: MSRV check (Rust 1.88)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: "1.88.0"
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: "tools/ai-review -> tools/ai-review/target"
+      - run: cargo check --workspace --all-features --all-targets

rustfmt.toml

@@ -0,0 +1,6 @@
+edition = "2021"
+max_width = 100
+use_small_heuristics = "Default"
+# imports_granularity and group_imports require nightly; uncomment if using nightly toolchain.
+# imports_granularity = "Crate"
+# group_imports = "StdExternalCrate"