Fix code quality violations and exclude Manifest from checks

Document application modes (development/debug/production)
Add global file drop handler, order column normalization, SPA hash fix
Serve CDN assets via /_vendor/ URLs instead of merging into bundles
Add production minification with license preservation
Improve JSON formatting for debugging and production optimization
Add CDN asset caching with CSS URL inlining for production builds
Add three-mode system (development, debug, production)
Update Manifest CLAUDE.md to reflect helper class architecture
Refactor Manifest.php into helper classes for better organization
Pre-manifest-refactor checkpoint: Add app_mode documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

node_modules/xxhashjs/test/XXH-test.js

@@ -0,0 +1,172 @@
+var assert = require('assert')
+var XXH = require('..')
+
+describe('XXH', function () {
+	var seed = 0
+
+	describe('with small input multiple of 4', function () {
+		var input = 'abcd'
+		var expected = 'A3643705' // Computed with xxHash C version
+
+		it('should return hash in a single step', function (done) {
+			var h = XXH.h32( input, seed ).toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+		it('should return hash in many steps', function (done) {
+			var H = XXH.h32( seed )
+			var h = H.update( input ).digest().toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+	})
+
+	describe('with medium input multiple of 4', function () {
+		var input = Array(1001).join('abcd')
+		var expected = 'E18CBEA'
+
+		it('should return hash in a single step', function (done) {
+			var h = XXH.h32( input, seed ).toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+		it('should return hash in many steps', function (done) {
+			var H = XXH.h32( seed )
+			var h = H.update( input ).digest().toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+	})
+
+	describe('with small input', function () {
+		var input = 'abc'
+		var expected = '32D153FF' // Computed with xxHash C version
+
+		it('should return hash in a single step', function (done) {
+			var h = XXH.h32( input, seed ).toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+		it('should return hash in many steps', function (done) {
+			var H = XXH.h32( seed )
+			var h = H.update( input ).digest().toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+	})
+
+	describe('with medium input', function () {
+		var input = Array(1000).join('abc')
+		var expected = '89DA9B6E'
+
+		it('should return hash in a single step', function (done) {
+			var h = XXH.h32( input, seed ).toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+		it('should return hash in many steps', function (done) {
+			var H = XXH.h32( seed )
+			var h = H.update( input ).digest().toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+	})
+
+	describe('with split medium input', function () {
+		var input = Array(1000).join('abc')
+		var expected = '89DA9B6E'
+
+		it('should return hash with split input < 16', function (done) {
+			var H = XXH.h32( seed )
+			var h = H
+				.update( input.slice(0, 10) )
+				.update( input.slice(10) )
+				.digest().toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+		it('should return hash with split input = 16', function (done) {
+			var H = XXH.h32( seed )
+			var h = H
+				.update( input.slice(0, 16) )
+				.update( input.slice(16) )
+				.digest().toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+		it('should return hash with split input > 16', function (done) {
+			var H = XXH.h32( seed )
+			var h = H
+				.update( input.slice(0, 20) )
+				.update( input.slice(20) )
+				.digest().toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+	})
+
+	describe('with utf-8 strings', function () {
+		var input = 'heiå'
+		var expected = 'DB5ABCCC' // Computed with xxHash C version
+
+		it('should return hash', function (done) {
+			var h = XXH.h32( input, seed ).toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+		it('should return hash in many steps', function (done) {
+			var H = XXH.h32( seed )
+			var h = H.update( input ).digest().toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+	})
+
+	describe('with utf-8 strings', function () {
+		var input = 'κόσμε'
+		var expected = 'D855F606' // Computed with xxHash C version
+
+		it('should return hash', function (done) {
+			var h = XXH.h32( input, seed ).toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+		it('should return hash in many steps', function (done) {
+			var H = XXH.h32( seed )
+			var h = H.update( input ).digest().toString(16).toUpperCase()
+
+			assert.equal( h, expected )
+			done()
+		})
+
+	})
+
+})