feat: complete testdrive-jsui capability extraction with full JavaScript test integration

Extract JavaScript UI framework functionality into dedicated testdrive-jsui capability
while maintaining 100% functionality preservation and integrating JavaScript tests
into the main Python test suite.

Phase 1 (Foundation Setup) - COMPLETED:
- Created capability directory structure with proper Python package layout
- Configured pyproject.toml with Node.js subprocess dependencies
- Set up package.json with Jest + JSDOM testing framework
- Implemented Python-JavaScript bridge for seamless test integration
- Created comprehensive capability Makefile with all testing targets
- Added detailed README documentation for capability usage

Phase 2 (Integration Layer) - COMPLETED:
- Built Python test wrappers for JavaScript test execution via subprocess
- Integrated with pytest discovery system for unified test experience
- Added capability targets to main Makefile delegation system
- Verified test integration works with main test suite

Phase 3 (Safe Migration) - COMPLETED:
- Copied (not moved) all JavaScript files to capability using safe copy-first approach
- Migrated 4 core JavaScript components and 11 test files (2,840+ lines)
- Verified all tests work in new location (11 Python tests + 7 JavaScript tests passing)
- Maintained dual-track testing capability for safety during transition

Phase 4 (Framework Enhancement) - COMPLETED:
- Enhanced testing framework with Python integration and coverage reporting
- Achieved 59% Python test coverage and 100% JavaScript test coverage
- Added performance benchmarking and component documentation

Phase 5 (Production Integration) - COMPLETED:
- Added standard 'test' target to capability Makefile for discovery system compatibility
- Integrated JavaScript tests into main Makefile with new targets:
  * test-js: Run JavaScript UI tests
  * test-all: Run all tests (Python + JavaScript + Capabilities)
- Updated help documentation to include new testing workflows
- Verified capability auto-discovery works via 'make test-capabilities'

Key Achievements:
- Zero-risk migration completed with copy-first safety approach
- Full Python-JavaScript test integration with 18 total passing tests
- JavaScript UI framework successfully extracted to dedicated capability
- Enhanced CI/CD integration with unified test command interface
- Clean architecture enabling future JavaScript framework evolution

Testing Status:
- ✅ All Python integration tests passing (11/11)
- ✅ All JavaScript component tests passing (7/7)
- ✅ Capability discovery integration working
- ✅ Main test suite integration complete
- ✅ Test coverage reporting functional (59% Python, 100% JavaScript)

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

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

capabilities/testdrive-jsui/node_modules/es-abstract/2025/EncodeForRegExpEscape.js

@@ -0,0 +1,74 @@
+'use strict';
+
+var NumberToString = require('./Number/toString');
+var StringIndexOf = require('./StringIndexOf');
+var StringPad = require('./StringPad');
+// var StringToCodePoints = require('./StringToCodePoints');
+var UnicodeEscape = require('./UnicodeEscape');
+var UTF16EncodeCodePoint = require('./UTF16EncodeCodePoint');
+
+var isLeadingSurrogate = require('../helpers/isLeadingSurrogate');
+var isTrailingSurrogate = require('../helpers/isTrailingSurrogate');
+
+var $TypeError = require('es-errors/type');
+
+var isCodePoint = require('../helpers/isCodePoint');
+var forEach = require('for-each');
+var regexTester = require('safe-regex-test');
+
+var isWhiteSpace = regexTester(/^\s$/);
+var isLineTerminator = regexTester(/^[\n\r\u2028\u2029]$/);
+
+// var punctuators = "(){}[]|,.?*+-^$=<>/#&!%:;@~'`\"\\"; // step 1
+var syntaxCharacter = '^$\\.*+?()[]{}|';
+
+var otherPunctuators = ",-=<>#&!%:;@~'`\""; // step 3
+// var toEscape = StringToCodePoints(otherPunctuators); // step 4
+
+var table64 = {
+	'\u0009': 't',
+	'\u000a': 'n',
+	'\u000b': 'v',
+	'\u000c': 'f',
+	'\u000d': 'r',
+	__proto__: null
+};
+
+module.exports = function EncodeForRegExpEscape(c) {
+	if (!isCodePoint(c)) {
+		throw new $TypeError('Assertion failed: `c` must be a valid Unicode code point');
+	}
+
+	var encoded = UTF16EncodeCodePoint(c);
+
+	if (StringIndexOf(syntaxCharacter, encoded, 0) > -1 || encoded === '\u002F') { // step 1
+		return '\\' + encoded; // step 1.a
+	} else if (encoded in table64) { // step 2
+		return '\\' + table64[encoded]; // step 2.a
+	}
+
+	if (
+		StringIndexOf(otherPunctuators, encoded, 0) > -1
+		|| isWhiteSpace(encoded)
+		|| isLineTerminator(encoded)
+		|| isLeadingSurrogate(c)
+		|| isTrailingSurrogate(c)
+	) { // step 5
+		if (c < 0xFF) { // step 5.a
+			var hex = NumberToString(c, 16); // step 5.a.i
+			return '\\x' + StringPad(hex, 2, '0', 'START'); // step 5.a.ii
+		}
+
+		var escaped = ''; // step 5.b
+
+		var codeUnits = encoded; // step 5.c
+
+		forEach(codeUnits, function (cu) { // step 5.d
+			escaped += UnicodeEscape(cu); // step 5.d.i
+		});
+
+		return escaped; // step 5.e
+	}
+
+	return encoded; // step 6
+};