fix: use BUN_PATH consistently in ensure_mcp_compliance.sh

Author: jfarcand

scripts/ensure_mcp_compliance.sh

@@ -22,6 +22,19 @@ YELLOW='\033[1;33m'
 BLUE='\033[0;34m'
 NC='\033[0m' # No Color
 
+# Find bun executable early (use full path for subprocess compatibility)
+# Python subprocess doesn't always inherit shell PATH, so we need absolute path
+BUN_PATH=$(which bun 2>/dev/null || echo "$HOME/.bun/bin/bun")
+if [ ! -x "$BUN_PATH" ]; then
+    # Try common installation locations
+    for candidate in "$HOME/.bun/bin/bun" "/usr/local/bin/bun" "/opt/homebrew/bin/bun"; do
+        if [ -x "$candidate" ]; then
+            BUN_PATH="$candidate"
+            break
+        fi
+    done
+fi
+
 # Get the directory where this script is located
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 PROJECT_ROOT="$( cd "$SCRIPT_DIR/.." && pwd )"
@@ -147,7 +160,8 @@ fi
 
 # Build the bridge before testing
 echo -e "${BLUE}==== Building pierre-claude-bridge for compliance testing... ====${NC}"
-if bun run build; then
+echo -e "${BLUE}     Using bun at: $BUN_PATH${NC}"
+if $BUN_PATH run build; then
     echo -e "${GREEN}[OK] Bridge built successfully${NC}"
 else
     echo -e "${RED}[FAIL] Bridge build failed${NC}"
@@ -237,14 +251,7 @@ fi
 # Run MCP compliance tests (REQUIRED - NO EXCEPTIONS POLICY)
 echo -e "${BLUE}==== Running MCP protocol compliance tests (REQUIRED)... ====${NC}"
 BRIDGE_PATH="$(pwd)/dist/cli.js"
-
-# Find bun executable (use full path for Python subprocess compatibility)
-BUN_PATH=$(which bun 2>/dev/null || echo "bun")
-if [ "$BUN_PATH" = "bun" ]; then
-    echo -e "${YELLOW}[WARN] Could not find bun in PATH, using 'bun' directly${NC}"
-else
-    echo -e "${GREEN}[OK] Found bun at: $BUN_PATH${NC}"
-fi
+echo -e "${BLUE}     Using bun at: $BUN_PATH${NC}"
 
 cd "$MCP_VALIDATOR_DIR"