fix: repair verifier env for 2 ccb_feature tasks

servo-scrollend-event-feat-001:
  - Add `clang` to Dockerfile + Dockerfile.sg_only apt install
  - mozangle build script needs libclang.so.* (shared lib); libclang-dev
    only provides the static lib and headers — clang package adds the SO

vscode-stale-diagnostics-feat-001:
  - Add libxkbfile-dev + libx11-dev to Dockerfile so native-keymap
    compiles cleanly during npm install
  - Replace `npx tsc` with `./node_modules/.bin/tsc` in test.sh (3 sites)
    to prevent npx auto-installing tsc@2.0.4 instead of the project's tsc

Both tasks were classified completed_fail due to environment bugs, not
agent difficulty. Agents made code changes; verifier toolchain was broken.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sjarmak

benchmarks/ccb_feature/servo-scrollend-event-feat-001/environment/Dockerfile

@@ -12,6 +12,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     autoconf \
     pkg-config \
     libclang-dev \
+    clang \
     && rm -rf /var/lib/apt/lists/*
 
 # Create claude user and writable work dirs before clone.

benchmarks/ccb_feature/servo-scrollend-event-feat-001/environment/Dockerfile.sg_only

@@ -13,6 +13,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     python3 \
     curl \
     libclang-dev \
+    clang \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /workspace

benchmarks/ccb_feature/vscode-stale-diagnostics-feat-001/environment/Dockerfile

@@ -9,6 +9,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential \
     python3 \
     python3-pip \
+    libxkbfile-dev \
+    libx11-dev \
     && rm -rf /var/lib/apt/lists/*
 
 # Create claude user and writable work dirs before clone.

benchmarks/ccb_feature/vscode-stale-diagnostics-feat-001/tests/test.sh

@@ -84,7 +84,7 @@ TYPE_CHECK_OK=1
 # Try the specific tsconfig for typescript-language-features first, then
 # fall back to a broader check on modified files only.
 if [ -f "extensions/typescript-language-features/tsconfig.json" ]; then
-    npx tsc --noEmit -p extensions/typescript-language-features/tsconfig.json 2>/logs/verifier/typecheck_errors.txt && TSC_RC=0 || TSC_RC=$?
+    ./node_modules/.bin/tsc --noEmit -p extensions/typescript-language-features/tsconfig.json 2>/logs/verifier/typecheck_errors.txt && TSC_RC=0 || TSC_RC=$?
     if [ "$TSC_RC" -ne 0 ]; then
         echo "FAIL: TypeScript type-check failed for typescript-language-features"
         TYPE_CHECK_OK=0
@@ -93,7 +93,7 @@ fi
 
 # Also check src/ if a tsconfig exists there
 if [ -f "src/tsconfig.json" ]; then
-    npx tsc --noEmit -p src/tsconfig.json 2>>/logs/verifier/typecheck_errors.txt && TSC_RC=0 || TSC_RC=$?
+    ./node_modules/.bin/tsc --noEmit -p src/tsconfig.json 2>>/logs/verifier/typecheck_errors.txt && TSC_RC=0 || TSC_RC=$?
     if [ "$TSC_RC" -ne 0 ]; then
         echo "FAIL: TypeScript type-check failed for src/"
         TYPE_CHECK_OK=0
@@ -117,7 +117,7 @@ $(git diff --cached --name-only -- '*.ts' 2>/dev/null || true)"
         echo "Checking $(echo "$MODIFIED_TS" | wc -l) modified .ts files..."
         echo "$MODIFIED_TS" | while read -r tsfile; do
             if [ -f "$tsfile" ]; then
-                npx tsc --noEmit --isolatedModules --skipLibCheck "$tsfile" 2>>/logs/verifier/typecheck_errors.txt || {
+                ./node_modules/.bin/tsc --noEmit --isolatedModules --skipLibCheck "$tsfile" 2>>/logs/verifier/typecheck_errors.txt || {
                     echo "FAIL: Type-check failed for $tsfile"
                     # Signal failure via a marker file since we're in a subshell
                     touch /logs/verifier/typecheck_failed