Add Automated Test Sequence Builder GUI with Visual Editor

[X9X0]

Summary

Implements a comprehensive visual test sequence builder for the LabLink desktop client, completing the automated test sequence feature announced in README. This provides users with an intuitive GUI to create, manage, and execute automated test sequences without writing code.

What's New

Test Sequence Builder Panel (1,300+ lines)

A full-featured 3-tab interface integrated into the main client window:

1. Build Sequence Tab

• Visual sequence metadata editor (name, description, category)
• Step management table with 5 columns (number, name, type, equipment, config)
• Complete step lifecycle: add, edit, delete, reorder (move up/down)
• Configuration summary for each step type
• Save, clear, and export to JSON functionality

2. Execute & Monitor Tab

• Equipment selection and execution controls
• Real-time progress bar and step tracking
• Live execution monitoring with current step indicator
• Detailed results display with pass/fail status for each step
• Measured values and error messages displayed inline
• Abort execution capability

3. Templates Tab

• Browse available test templates
• Template information and documentation
• Create sequences from templates with parameter configuration
• Support for voltage accuracy and frequency response templates

Visual Step Editor Dialog

Comprehensive editor supporting all 9 step types:

• setup: Equipment initialization with SCPI commands
• command: Send SCPI commands with expected response validation
• measurement: Take measurements with configurable parameters
• delay: Add settling time delays (0-3600 seconds)
• validation: Validate measurements with 8 operators (==, !=, <, <=, >, >=, in_range, out_of_range)
• sweep: Parameter sweeping with linear/log scales (2-1000 points)
• conditional: Conditional branching based on expressions
• loop: Repeat steps with configurable count (1-1000 iterations)
• cleanup: Reset equipment state

Advanced Options:

• Critical flag (abort on failure)
• Retry on failure with max retries (0-10)
• Log data option

Template Configuration Dialog

• Dynamic parameter forms based on selected template
• Voltage accuracy: comma-separated test points
• Frequency response: start/stop frequency configuration
• Equipment ID assignment

Client API Integration

Added 8 new test sequence API methods:

• create_test_sequence() - Create and save sequences
• get_test_sequence() - Retrieve sequences by ID
• list_test_templates() - Get available templates
• create_from_template() - Instantiate template with parameters
• execute_test_sequence() - Execute with environment data
• get_execution_status() - Poll for progress and results
• abort_test_execution() - Stop running tests
• get_active_test_executions() - List active tests

Technical Details

Architecture:

• Qt signals for thread-safe WebSocket integration (prepared for future real-time updates)
• Async/await support with qasync decorators
• Progress polling with QTimer (1-second intervals during execution)
• Clean separation: Panel → API Client → REST endpoints

User Experience:

• Type-specific configuration forms (only show relevant fields per step type)
• Table-based step management (no drag-and-drop complexity)
• Automatic step renumbering on reorder/delete
• JSON export for version control and sharing
• Rich text results display with color coding (green=pass, red=fail)

Code Quality:

• 1,300+ lines of well-documented GUI code
• Consistent with existing panel patterns (SchedulerPanel, DiagnosticsPanel)
• Comprehensive error handling and user feedback
• Logging for debugging and audit trails

Files Changed

• client/api/client.py (+151 lines) - Test sequence API methods
• client/ui/test_sequence_panel.py (+1,300 lines) - New comprehensive panel
• client/ui/main_window.py (+3 lines) - Integration into main window tabs
• README.md (+8 lines) - Mark feature as implemented
• ROADMAP.md (+11 lines) - Document completion in automation and client sections

Backend Integration

The backend test automation API (15+ endpoints) was already fully implemented with:

• 9 step types with comprehensive execution engine
• Parameter sweep support (linear/log scales)
• 6 validation operators with tolerance support
• Test result archival and trending
• Template library (voltage accuracy, frequency response)
• Multi-equipment coordination
• Real-time progress tracking

This PR completes the feature by providing the missing GUI interface.

Testing Notes

Manual Testing:

1. Launch client and connect to server
2. Navigate to "Test Sequences" tab
3. Create sequence from template (Templates tab → Create from Template)
4. Add/edit/reorder steps (Build Sequence tab)
5. Execute sequence (Execute & Monitor tab)
6. Observe real-time progress and results
7. Export sequence to JSON

Server Requirements:

• Server must be running with test automation endpoints enabled
• Equipment must be connected for actual execution
• Mock equipment can be used for testing sequence builder UI

Screenshots

(To be added after PR review)

Related Issues

Closes #[issue number if applicable]
Implements feature from README "In Development" section

Migration Notes

No breaking changes

• Purely additive feature
• No configuration changes required
• No database schema changes

Future Enhancements

• WebSocket real-time updates (signals already prepared)
• Sequence library/repository for saving/loading sequences
• Sequence validation before execution
• Import sequences from JSON files
• Step templates and snippets
• Sequence versioning and history
• Graphical step flow visualization
• Parallel step execution support

---

Feature Status: ✅ Complete and ready for testing
Documentation: ✅ README and ROADMAP updated
Backward Compatibility: ✅ Fully backward compatible
API Impact: ✅ No breaking changes