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/helpers/bytesAsFloat16.js

@@ -0,0 +1,47 @@
+'use strict';
+
+var $pow = require('math-intrinsics/pow');
+
+module.exports = function bytesAsFloat32(rawBytes) {
+	// return new $Float16Array(new $Uint8Array(rawBytes).buffer)[0];
+	/*
+        Let value be the byte elements of rawBytes concatenated and interpreted as a little-endian bit string encoding of an IEEE 754-2019 binary16 value.
+        If value is a NaN, return NaN.
+        Return the Number value that corresponds to value.
+    */
+
+	var bits = (rawBytes[1] << 8) | rawBytes[0];
+
+	// extract sign, exponent, mantissa
+	var sign = bits & 0x8000 ? -1 : 1;
+	var exponent = (bits & 0x7C00) >> 10;
+	var mantissa = bits & 0x03FF;
+
+	// zero (±0)
+	if (exponent === 0 && mantissa === 0) {
+		return sign === 1 ? 0 : -0;
+	}
+
+	// infinities
+	if (exponent === 0x1F && mantissa === 0) {
+		return sign === 1 ? Infinity : -Infinity;
+	}
+
+	// NaN
+	if (exponent === 0x1F && mantissa !== 0) {
+		return NaN;
+	}
+
+	// remove bias (15)
+	exponent -= 15;
+
+	// subnormals
+	if (exponent === -15) {
+		// value = sign * (mantissa) * 2^(1-bias-10) = mantissa * 2^(-14-10)
+		return sign * mantissa * $pow(2, -24);
+	}
+
+	// normals
+	// value = sign * (1 + mantissa/2^10) * 2^exponent
+	return sign * (1 + (mantissa * $pow(2, -10))) * $pow(2, exponent);
+};