Add modular project detection

modules/detect.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+set -euo pipefail
+
+echo "================================"
+echo " Davidson CI - Project Detection"
+echo "================================"
+
+PHP_COUNT=$(find . -type f -name "*.php" \
+    -not -path "./vendor/*" | wc -l)
+
+JS_COUNT=$(find . -type f \
+    \( -name "*.js" -o -name "*.mjs" -o -name "*.cjs" \) \
+    -not -path "./node_modules/*" | wc -l)
+
+TS_COUNT=$(find . -type f \
+    \( -name "*.ts" -o -name "*.tsx" \) \
+    -not -path "./node_modules/*" | wc -l)
+
+CSS_COUNT=$(find . -type f -name "*.css" \
+    -not -path "./node_modules/*" | wc -l)
+
+echo
+echo "Detected:"
+echo "PHP:        $PHP_COUNT"
+echo "JavaScript: $JS_COUNT"
+echo "TypeScript: $TS_COUNT"
+echo "CSS:        $CSS_COUNT"
+echo
+
+# Make detection results available to later CI steps.
+{
+    echo "DAVIDSON_PHP_COUNT=$PHP_COUNT"
+    echo "DAVIDSON_JS_COUNT=$JS_COUNT"
+    echo "DAVIDSON_TS_COUNT=$TS_COUNT"
+    echo "DAVIDSON_CSS_COUNT=$CSS_COUNT"
+} >> "${GITHUB_ENV:-/dev/null}"