Initial HIT-Leiden implementation (CPU-first baseline)

.github/agents/copilot-instructions.md

@@ -0,0 +1,29 @@
+# hit-leiden Development Guidelines
+
+Auto-generated from all feature plans. Last updated: 2026-02-19
+
+## Active Technologies
+
+- Rust stable (>= 1.76) + `rayon`, `clap`, `serde`/`serde_json`, `thiserror`, `smallvec`, `bitvec`, optional FFI (`cxx` or `bindgen`-based backend) (001-hit-leiden-rust)
+
+## Project Structure
+
+```text
+src/
+tests/
+```
+
+## Commands
+
+cargo test [ONLY COMMANDS FOR ACTIVE TECHNOLOGIES][ONLY COMMANDS FOR ACTIVE TECHNOLOGIES] cargo clippy
+
+## Code Style
+
+Rust stable (>= 1.76): Follow standard conventions
+
+## Recent Changes
+
+- 001-hit-leiden-rust: Added Rust stable (>= 1.76) + `rayon`, `clap`, `serde`/`serde_json`, `thiserror`, `smallvec`, `bitvec`, optional FFI (`cxx` or `bindgen`-based backend)
+
+<!-- MANUAL ADDITIONS START -->
+<!-- MANUAL ADDITIONS END -->

.github/workflows/ci.yml

@@ -0,0 +1,14 @@
+name: ci
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Test
+        run: cargo test --all-targets

.gitignore

@@ -13,6 +13,25 @@ target
 # Contains mutation testing data
 **/mutants.out*/
 
+# Rust build outputs and profiling artifacts
+release/
+*.rlib
+*.prof*
+*.out
+
+# Logs and local environment
+*.log
+.env*
+.private
+
+# Editor and OS artifacts
+.vscode/
+.idea/
+.DS_Store
+Thumbs.db
+*.tmp
+*.swp
+
 # RustRover
 #  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
 #  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore