fix(wasm): use per-engine cache dirs on Windows to avoid file lock error (#624)

* fix(wasm): use per-engine cache dirs on Windows to avoid file lock error (#448)

On Windows, multiple wasmtime Engine instances sharing the default
compilation cache directory hit OS error 33 (ERROR_LOCK_VIOLATION)
because Windows holds exclusive file locks on memory-mapped cache
files. This is especially triggered when the Telegram channel WASM
module is loaded at startup and then hot-activated via the Extensions
UI.

Fix by giving each engine its own cache subdirectory on Windows
(~/.cache/ironclaw/wasmtime-tools/ and wasmtime-channels/). On
Unix the shared default cache continues to work as before.

Also adds Windows CI jobs (cargo check + clippy across all feature
flag combinations) to catch Windows-specific issues going forward.

Closes #448

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix: silence Windows clippy warnings for platform-gated code

Gate PathBuf import behind #[cfg(unix)] in container.rs (only used
in Unix socket path), suppress unused_mut on conflicts Vec in
channels.rs (mutations are platform-gated), and add cfg gates on
keychain constants and hex_to_bytes that are only used on macOS/Linux.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix: escape directory path in TOML cache config to prevent injection

Use double-quoted TOML strings with backslash and double-quote
escaping for the cache directory path, preventing breakage or
injection when paths contain special characters (e.g. single
quotes on Unix, backslashes on Windows).

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix: resolve cargo fmt formatting errors

Fix import ordering in container.rs and line wrapping in runtime.rs
to pass the CI formatting check.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

* fix(ci): restore Path import for all platforms, keep PathBuf unix-only

Path is used in non-cfg-gated functions (lines 148, 244) so it must
be available on all platforms. Only PathBuf is unix-specific.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

---------

Co-authored-by: Claude Opus 4.6 <[email protected]>

.github/workflows/test.yml

@@ -51,6 +51,32 @@ jobs:
       - name: Run Telegram Channel Tests
         run: cargo test --manifest-path channels-src/telegram/Cargo.toml -- --nocapture
 
+  windows-build:
+    name: Windows Build (${{ matrix.name }})
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: all-features
+            flags: "--all-features"
+          - name: default
+            flags: ""
+          - name: libsql-only
+            flags: "--no-default-features --features libsql"
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          profile: minimal
+      - uses: Swatinem/rust-cache@v2
+        with:
+          key: windows-${{ matrix.name }}
+      - name: Check compilation
+        run: cargo check --all --benches --tests --examples ${{ matrix.flags }}
+
   wasm-wit-compat:
     name: WASM WIT Compatibility
     runs-on: ubuntu-latest
@@ -100,10 +126,10 @@ jobs:
     name: Run Tests
     runs-on: ubuntu-latest
     if: always()
-    needs: [tests, telegram-tests, wasm-wit-compat, docker-build, version-check]
+    needs: [tests, telegram-tests, wasm-wit-compat, docker-build, windows-build, version-check]
     steps:
       - run: |
-          if [[ "${{ needs.tests.result }}" != "success" || "${{ needs.telegram-tests.result }}" != "success" || "${{ needs.wasm-wit-compat.result }}" != "success" || "${{ needs.docker-build.result }}" != "success" ]]; then
+          if [[ "${{ needs.tests.result }}" != "success" || "${{ needs.telegram-tests.result }}" != "success" || "${{ needs.wasm-wit-compat.result }}" != "success" || "${{ needs.docker-build.result }}" != "success" || "${{ needs.windows-build.result }}" != "success" ]]; then
             echo "One or more jobs failed"
             exit 1
           fi