Add Rust Hello World package

.github/workflows/main-ci.yml

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+name: Main CI
+
+on:
+  push:
+    branches: [ main ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  format:
+    name: Format
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+      - name: Check formatting
+        run: cargo fmt --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+      - name: Run clippy
+        run: cargo clippy -- -D warnings
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Run tests
+        run: cargo test --verbose

.github/workflows/pr-ci.yml

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+name: PR CI
+
+on:
+  pull_request:
+    branches: [ main ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  format:
+    name: Format
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+      - name: Check formatting
+        run: cargo fmt --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+      - name: Run clippy
+        run: cargo clippy -- -D warnings
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Run tests
+        run: cargo test --verbose

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "rust-hello-world"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

docs.md

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+# Noridoc: rust-hello-world
+
+Path: @/.worktrees/rust-hello-world
+
+### Overview
+
+- Binary Rust package serving as a minimal "Hello World" example
+- Verifies Rust toolchain installation and basic project setup (rustc 1.91.0, cargo 1.91.0)
+- Uses standard Cargo project structure with src/main.rs entry point
+- Edition 2024 - latest Rust edition available
+
+### How it fits into the larger codebase
+
+- Located in a git worktree (separate working directory) to maintain isolation from the main monorepo
+- Does not affect main repository commits since .worktrees/ is gitignored at @/.gitignore
+- Demonstrates the first Rust infrastructure setup for the Nori system
+- Serves as a template for future Rust packages or can be replaced with actual project code
+- No dependencies on other parts of the monorepo; entirely self-contained
+
+### Core Implementation
+
+- Entry point: src/main.rs contains a simple println!("Hello, world!") implementation
+- Build configuration: Cargo.toml defines package metadata (name: rust-hello-world, version: 0.1.0, edition: 2024)
+- Build output directory: target/ (gitignored via local .gitignore)
+- Cargo.lock tracks dependency versions (currently no external dependencies)
+- No dependencies defined, pure standard library usage
+
+### Things to Know
+
+- This is a binary crate (executable), not a library crate
+- The gitignored .worktrees/ directory means this package does not integrate with the main repository version control
+- Rust 1.91.0 is the minimum required toolchain - defined by rust-toolchain.toml if present or system default
+- target/ build artifacts are local to the worktree and gitignored
+- The package can be compiled with `cargo build` or run directly with `cargo run`
+- CI/CD: Separate GitHub Actions workflows for different Git events:
+  - @/.github/workflows/pr-ci.yml runs on pull requests
+  - @/.github/workflows/main-ci.yml runs on pushes to main
+  - Both run: cargo fmt --check (formatting), cargo clippy -- -D warnings (linting), cargo test --verbose (tests)
+
+Created and maintained by Nori.

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}