fix: publish npm releases and clarify install identifiers

tests/docs/install-identifiers.test.js

@@ -0,0 +1,51 @@
+'use strict';
+
+const assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+
+const repoRoot = path.resolve(__dirname, '..', '..');
+
+let passed = 0;
+let failed = 0;
+
+function test(name, fn) {
+  try {
+    fn();
+    console.log(`  ✓ ${name}`);
+    passed++;
+  } catch (error) {
+    console.log(`  ✗ ${name}`);
+    console.log(`    Error: ${error.message}`);
+    failed++;
+  }
+}
+
+const publicInstallDocs = [
+  'README.md',
+  'README.zh-CN.md',
+  'docs/pt-BR/README.md',
+  'docs/ja-JP/skills/configure-ecc/SKILL.md',
+  'docs/zh-CN/skills/configure-ecc/SKILL.md',
+];
+
+console.log('\n=== Testing public install identifiers ===\n');
+
+for (const relativePath of publicInstallDocs) {
+  const content = fs.readFileSync(path.join(repoRoot, relativePath), 'utf8');
+
+  test(`${relativePath} does not use the stale ecc@ecc plugin identifier`, () => {
+    assert.ok(!content.includes('ecc@ecc'));
+  });
+
+  test(`${relativePath} documents the canonical marketplace plugin identifier`, () => {
+    assert.ok(content.includes('everything-claude-code@everything-claude-code'));
+  });
+}
+
+if (failed > 0) {
+  console.log(`\nFailed: ${failed}`);
+  process.exit(1);
+}
+
+console.log(`\nPassed: ${passed}`);