Add --summary flag support to coverage script

Add --summary flag to hide detailed test output and coverage tables,
showing only the final coverage summary. Add console.log blank line
after header for consistent formatting. Change header text from
"Running Coverage" to "Test Coverage" for consistency.

Author: jdalton

scripts/cover.mjs

@@ -5,6 +5,7 @@
  * Options:
  *   --code-only  Run only code coverage (skip type coverage)
  *   --type-only  Run only type coverage (skip code coverage)
+ *   --summary    Show only coverage summary (hide detailed output)
  */
 
 import path from 'node:path'
@@ -24,16 +25,18 @@ const { values } = parseArgs({
   options: {
     'code-only': { type: 'boolean', default: false },
     'type-only': { type: 'boolean', default: false },
+    summary: { type: 'boolean', default: false },
   },
   strict: false,
   allowPositionals: true,
 })
 
-printHeader('Running Coverage')
+printHeader('Test Coverage')
+console.log('')
 
 // Run vitest with coverage enabled, capturing output
 // Filter out custom flags that vitest doesn't understand
-const customFlags = ['--code-only', '--type-only']
+const customFlags = ['--code-only', '--type-only', '--summary']
 const vitestArgs = [
   '-q',
   'run',
@@ -99,7 +102,7 @@ try {
     const testSummaryMatch = output.match(
       /Test Files\s+\d+[^\n]*\n[\s\S]*?Duration\s+[\d.]+m?s[^\n]*/,
     )
-    if (testSummaryMatch) {
+    if (!values.summary && testSummaryMatch) {
       console.log()
       console.log(testSummaryMatch[0])
       console.log()
@@ -112,13 +115,15 @@ try {
     const allFilesMatch = output.match(/All files\s+\|\s+([\d.]+)\s+\|[^\n]*/)
 
     if (coverageHeaderMatch && allFilesMatch) {
-      console.log(' % Coverage report from v8')
-      console.log(coverageHeaderMatch[1])
-      console.log(coverageHeaderMatch[2])
-      console.log(coverageHeaderMatch[1])
-      console.log(allFilesMatch[0])
-      console.log(coverageHeaderMatch[1])
-      console.log()
+      if (!values.summary) {
+        console.log(' % Coverage report from v8')
+        console.log(coverageHeaderMatch[1])
+        console.log(coverageHeaderMatch[2])
+        console.log(coverageHeaderMatch[1])
+        console.log(allFilesMatch[0])
+        console.log(coverageHeaderMatch[1])
+        console.log()
+      }
 
       const codeCoveragePercent = Number.parseFloat(allFilesMatch[1])
       console.log(' Coverage Summary')
@@ -169,20 +174,22 @@ try {
     )
 
     // Display output
-    if (testSummaryMatch) {
+    if (!values.summary && testSummaryMatch) {
       console.log()
       console.log(testSummaryMatch[0])
       console.log()
     }
 
     if (coverageHeaderMatch && allFilesMatch) {
-      console.log(' % Coverage report from v8')
-      console.log(coverageHeaderMatch[1])
-      console.log(coverageHeaderMatch[2])
-      console.log(coverageHeaderMatch[1])
-      console.log(allFilesMatch[0])
-      console.log(coverageHeaderMatch[1])
-      console.log()
+      if (!values.summary) {
+        console.log(' % Coverage report from v8')
+        console.log(coverageHeaderMatch[1])
+        console.log(coverageHeaderMatch[2])
+        console.log(coverageHeaderMatch[1])
+        console.log(allFilesMatch[0])
+        console.log(coverageHeaderMatch[1])
+        console.log()
+      }
 
       // Display cumulative summary
       if (typeCoverageMatch) {