Import IKAR messenger client and server

.github/actions/setup-e2ee/action.yml

@@ -0,0 +1,17 @@
+name: Build E2EE test library
+description: Build and test the pinned C crypto core and expose it to Flutter tests.
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: |
+        cmake -S native/crypto-core -B build/native-tests/crypto-core -DCMAKE_BUILD_TYPE=Debug
+        cmake --build build/native-tests/crypto-core --config Debug --parallel 2
+        ctest --test-dir build/native-tests/crypto-core -C Debug --output-on-failure
+        if [ "$RUNNER_OS" = "Windows" ]; then
+          echo "QLYRA_E2EE_LIBRARY=$GITHUB_WORKSPACE/build/native-tests/crypto-core/Debug/komet_crypto.dll" >> "$GITHUB_ENV"
+        elif [ "$RUNNER_OS" = "macOS" ]; then
+          echo "QLYRA_E2EE_LIBRARY=$GITHUB_WORKSPACE/build/native-tests/crypto-core/libkomet_crypto.dylib" >> "$GITHUB_ENV"
+        else
+          echo "QLYRA_E2EE_LIBRARY=$GITHUB_WORKSPACE/build/native-tests/crypto-core/libkomet_crypto.so" >> "$GITHUB_ENV"
+        fi

.github/actions/setup-rust/action.yml

@@ -0,0 +1,26 @@
+name: Setup Rust
+description: >
+  Install the Rust toolchain with platform targets and a build cache, so
+  cargokit can compile the native libraries during the Flutter build. kolibri
+  comes from pub.dev and builds inside the pub cache, so only the in-repo crate
+  is listed here; the shared cargo registry and git checkouts are cached anyway.
+
+inputs:
+  targets:
+    description: Comma-separated rustup targets for the platform being built.
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: Install Rust toolchain
+      uses: dtolnay/rust-toolchain@stable
+      with:
+        targets: ${{ inputs.targets }}
+
+    - name: Cache Rust build
+      uses: Swatinem/rust-cache@v2
+      with:
+        workspaces: |
+          native/qlyra_crypto/rust
+          native/komet_tlottie/rust