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/find-up/index.d.ts

@@ -0,0 +1,137 @@
+import {Options as LocatePathOptions} from 'locate-path';
+
+declare const stop: unique symbol;
+
+declare namespace findUp {
+	interface Options extends LocatePathOptions {}
+
+	type StopSymbol = typeof stop;
+
+	type Match = string | StopSymbol | undefined;
+}
+
+declare const findUp: {
+	/**
+	Find a file or directory by walking up parent directories.
+
+	@param name - Name of the file or directory to find. Can be multiple.
+	@returns The first path found (by respecting the order of `name`s) or `undefined` if none could be found.
+
+	@example
+	```
+	// /
+	// └── Users
+	//     └── sindresorhus
+	//         ├── unicorn.png
+	//         └── foo
+	//             └── bar
+	//                 ├── baz
+	//                 └── example.js
+
+	// example.js
+	import findUp = require('find-up');
+
+	(async () => {
+		console.log(await findUp('unicorn.png'));
+		//=> '/Users/sindresorhus/unicorn.png'
+
+		console.log(await findUp(['rainbow.png', 'unicorn.png']));
+		//=> '/Users/sindresorhus/unicorn.png'
+	})();
+	```
+	*/
+	(name: string | string[], options?: findUp.Options): Promise<string | undefined>;
+
+	/**
+	Find a file or directory by walking up parent directories.
+
+	@param matcher - Called for each directory in the search. Return a path or `findUp.stop` to stop the search.
+	@returns The first path found or `undefined` if none could be found.
+
+	@example
+	```
+	import path = require('path');
+	import findUp = require('find-up');
+
+	(async () => {
+		console.log(await findUp(async directory => {
+			const hasUnicorns = await findUp.exists(path.join(directory, 'unicorn.png'));
+			return hasUnicorns && directory;
+		}, {type: 'directory'}));
+		//=> '/Users/sindresorhus'
+	})();
+	```
+	*/
+	(matcher: (directory: string) => (findUp.Match | Promise<findUp.Match>), options?: findUp.Options): Promise<string | undefined>;
+
+	sync: {
+		/**
+		Synchronously find a file or directory by walking up parent directories.
+
+		@param name - Name of the file or directory to find. Can be multiple.
+		@returns The first path found (by respecting the order of `name`s) or `undefined` if none could be found.
+		*/
+		(name: string | string[], options?: findUp.Options): string | undefined;
+
+		/**
+		Synchronously find a file or directory by walking up parent directories.
+
+		@param matcher - Called for each directory in the search. Return a path or `findUp.stop` to stop the search.
+		@returns The first path found or `undefined` if none could be found.
+
+		@example
+		```
+		import path = require('path');
+		import findUp = require('find-up');
+
+		console.log(findUp.sync(directory => {
+			const hasUnicorns = findUp.sync.exists(path.join(directory, 'unicorn.png'));
+			return hasUnicorns && directory;
+		}, {type: 'directory'}));
+		//=> '/Users/sindresorhus'
+		```
+		*/
+		(matcher: (directory: string) => findUp.Match, options?: findUp.Options): string | undefined;
+
+		/**
+		Synchronously check if a path exists.
+
+		@param path - Path to the file or directory.
+		@returns Whether the path exists.
+
+		@example
+		```
+		import findUp = require('find-up');
+
+		console.log(findUp.sync.exists('/Users/sindresorhus/unicorn.png'));
+		//=> true
+		```
+		*/
+		exists(path: string): boolean;
+	}
+
+	/**
+	Check if a path exists.
+
+	@param path - Path to a file or directory.
+	@returns Whether the path exists.
+
+	@example
+	```
+	import findUp = require('find-up');
+
+	(async () => {
+		console.log(await findUp.exists('/Users/sindresorhus/unicorn.png'));
+		//=> true
+	})();
+	```
+	*/
+	exists(path: string): Promise<boolean>;
+
+	/**
+	Return this in a `matcher` function to stop the search and force `findUp` to immediately return `undefined`.
+	*/
+	readonly stop: findUp.StopSymbol;
+};
+
+export = findUp;