fix: remove duplicate hooks declaration from plugin.json

Fixes #103, #106, #108

Claude Code automatically loads hooks/hooks.json by convention.
Explicitly declaring it in plugin.json causes a duplicate detection
error: "Duplicate hooks file detected"

Added regression test to prevent this from being reintroduced.

tests/hooks/hooks.test.js

@@ -325,6 +325,22 @@ async function runTests() {
     }
   })) passed++; else failed++;
 
+  // plugin.json validation
+  console.log('\nplugin.json Validation:');
+
+  if (test('plugin.json does NOT have explicit hooks declaration', () => {
+    // Claude Code automatically loads hooks/hooks.json by convention.
+    // Explicitly declaring it in plugin.json causes a duplicate detection error.
+    // See: https://github.com/affaan-m/everything-claude-code/issues/103
+    const pluginPath = path.join(__dirname, '..', '..', '.claude-plugin', 'plugin.json');
+    const plugin = JSON.parse(fs.readFileSync(pluginPath, 'utf8'));
+
+    assert.ok(
+      !plugin.hooks,
+      'plugin.json should NOT have "hooks" field - Claude Code auto-loads hooks/hooks.json'
+    );
+  })) passed++; else failed++;
+
   // Summary
   console.log('\n=== Test Results ===');
   console.log(`Passed: ${passed}`);