Fix five stale rule counts and the validator blind spots that hid them

single-font's retirement made the detector 59 rules; both READMEs still
said 60 in five places, and the count validator reported clean because
'deterministic detector rules' puts a word the regex never expected
between the qualifier and the noun, and README.npm.md was never in the
checked file list. The regex now tolerates the detector infix, counts
qualified 'issues' claims, and README.npm.md joins the list.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/build.js

@@ -59,6 +59,7 @@ function generateCounts(rootDir, skills, buildDir) {
   const filesToCheck = [
     'site/pages/index.astro',
     'README.md',
+    'README.npm.md',
     'AGENTS.md',
     '.claude-plugin/plugin.json',
     '.claude-plugin/marketplace.json',
@@ -86,9 +87,13 @@ function generateCounts(rootDir, skills, buildDir) {
     // Check for stale detection counts. Use the changelog-stripped content
     // so historical counts in changelog entries (e.g. "28 rules" from an
     // older release) don't flag against the current detector total.
-    const detectPattern = /\b(\d+)\s+(deterministic\s+)?(checks|patterns|rules|detections)/gi;
+    // "detector" as an infix ("60 deterministic detector rules") and
+    // qualified "issues" both evaded the old pattern, which is how five
+    // stale counts shipped while the validator reported clean.
+    const detectPattern = /\b(\d+)\s+(deterministic\s+)?(detector\s+)?(checks|patterns|rules|detections|issues)\b/gi;
     for (const match of strippedContent.matchAll(detectPattern)) {
       const num = parseInt(match[1]);
+      if (match[4] === 'issues' && !match[2]) continue; // plain "issues" is prose, not a count claim
       if (num !== detectionCount && num > 10) { // ignore small numbers like "3 patterns"
         console.error(`  ❌ ${relPath}: found "${match[0]}" but detection count is ${detectionCount}`);
         errors++;