ci: improve CI stability with parallel builds, Valgrind, and coverage

ci-build.sh

@@ -303,7 +303,7 @@ echo "Starting parallel builds..."
 pids=()
 for idx in 1 2 3 4; do
     if [ $idx -le ${#tests[@]} ]; then
-        # All builds run Valgrind on Linux
+        # All builds run Valgrind
         if [ "$ARCH" = "linux" ]; then
             run_valgrind="yes"
             if [ $idx -eq 1 ]; then
@@ -328,10 +328,11 @@ for idx in 1 2 3 4; do
     fi
 done
 
+# Wait for all builds and check exit codes
 failed_builds=()
-for i in \"${!pids[@]}\"; do
+for i in "${!pids[@]}"; do
     idx=$((i + 1))
-    if wait \"${pids[$i]}\"; then
+    if wait "${pids[$i]}"; then
         stats=""
         if [ -f "build-$idx.log" ]; then
             stats_line=$(grep "^STATS:" "build-$idx.log" | tail -1)
@@ -344,6 +345,7 @@ for i in \"${!pids[@]}\"; do
             cov_branches=$(echo "$stats_line" | grep -oE "cov_branches=[0-9.]+%|cov_branches=n/a" | cut -d= -f2)
             time=$(echo "$stats_line" | grep -oE "time=[0-9]+m[0-9]+s" | cut -d= -f2)
             
+            # Format: passed/failed for each test type
             unit_str="${unit_p:-0}/${unit_f:-0}"
             func_str="${func_p:-0}/${func_f:-0}"
             
@@ -362,6 +364,7 @@ done
 
 echo
 
+# Show failed builds full logs
 for idx in "${failed_builds[@]}"; do
     if [ -f "build-$idx.log" ]; then
         echo "=== Build $idx (FAILED) - full log ==="