Add Rust SDK for mcpd plugins

.github/workflows/build.yaml

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+name: Build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  examples:
+    name: Build Examples
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - uses: dtolnay/rust-toolchain@stable # Action's stable branch. No SHA pinning - repo doesn't publish releases.
+      - name: Install protoc
+        run: sudo apt-get update && sudo apt-get install -y protobuf-compiler
+      - name: Build all examples
+        run: cargo build --examples --release
+      - name: List built examples
+        run: ls -lh target/release/examples/
+
+  static-binary:
+    name: Build Static Binary
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - uses: dtolnay/rust-toolchain@stable # Action's stable branch. No SHA pinning - repo doesn't publish releases.
+        with:
+          targets: x86_64-unknown-linux-musl
+      - name: Install protoc
+        run: sudo apt-get update && sudo apt-get install -y protobuf-compiler
+      - name: Build static binary
+        run: cargo build --release --target x86_64-unknown-linux-musl
+      - name: Verify static library
+        run: |
+          file target/x86_64-unknown-linux-musl/release/libmcpd_plugins_sdk.rlib
+          echo "Static library built successfully"

.github/workflows/lint.yaml

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+name: Lint
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  rustfmt:
+    name: Format Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - uses: dtolnay/rust-toolchain@stable # Action's stable branch. No SHA pinning - repo doesn't publish releases.
+        with:
+          components: rustfmt
+      - name: Install protoc
+        run: sudo apt-get update && sudo apt-get install -y protobuf-compiler
+      - name: Check formatting
+        run: cargo fmt --all -- --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - uses: dtolnay/rust-toolchain@stable # Action's stable branch. No SHA pinning - repo doesn't publish releases.
+        with:
+          components: clippy
+      - name: Install protoc
+        run: sudo apt-get update && sudo apt-get install -y protobuf-compiler
+      - name: Run clippy
+        run: cargo clippy --all-targets --all-features -- -D warnings

.github/workflows/security.yaml

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+name: Security
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  schedule:
+    # Run security checks daily at 00:00 UTC.
+    - cron: '0 0 * * *'
+
+jobs:
+  deny:
+    name: Cargo Deny
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - name: Install protoc
+        run: sudo apt-get update && sudo apt-get install -y protobuf-compiler
+      - uses: EmbarkStudios/cargo-deny-action@f2ba7abc2abebaf185c833c3961145a3c275caad # v2.0.13
+        with:
+          arguments: --all-features
+
+  audit:
+    name: Security Audit
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - name: Install protoc
+        run: sudo apt-get update && sudo apt-get install -y protobuf-compiler
+      - uses: actions-rust-lang/audit@66172f762800e4befdf5c0765d24bd4c79891f47 # v1.2.5

.github/workflows/test.yaml

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+name: Test
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+
+jobs:
+  test:
+    name: Test Suite
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        rust: [stable, 1.83.0]
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - uses: dtolnay/rust-toolchain@stable # Action's stable branch. No SHA pinning - repo doesn't publish releases.
+        with:
+          toolchain: ${{ matrix.rust }}
+      - name: Install protoc (Ubuntu)
+        if: runner.os == 'Linux'
+        run: sudo apt-get update && sudo apt-get install -y protobuf-compiler
+      - name: Install protoc (macOS)
+        if: runner.os == 'macOS'
+        run: brew install protobuf
+      - name: Run tests
+        run: cargo test --all-features
+      - name: Run doc tests
+        run: cargo test --doc --all-features

.gitignore

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+# Rust build artifacts.
+/target/
+Cargo.lock
+
+# Generated code.
+/src/generated/
+
+# Downloaded proto files.
+/proto/
+
+# IDE files.
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# macOS.
+.DS_Store
+
+# Debug files.
+*.pdb