[enhancement] Add Real-Time Session Event Monitoring for Task Execution Feedback

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Background

Recent changes in the Copilot SDK (v0.1.24-preview.0) include:

• Event naming improvements: The SDK renamed tool.execution_end to tool.execution_complete for clarity (PR #385 by Andrew Yoon, merged Feb 6, 2026)
• Session event handling: Enhanced session event subscription mechanisms with better reliability (PR #24 by nathfavour)
• Forward compatibility tests: New tests verify handling of unknown session event types (PR #35)
• CLI update: @github/copilot upgraded to 0.0.405 (PR #396 by Devraj Mehta, merged Feb 7, 2026)

Commit reference: 439e0f0

Proposal

Implement real-time session event monitoring in src/services/executor.ts to provide users with granular feedback during task execution. The SDK's session event API allows subscriptions to events like:

• tool.execution_complete (formerly tool.execution_end)
• Progress updates from Copilot agents
• Token usage and performance metrics

Implementation approach:

1. Add event listeners in the Copilot SDK wrapper (src/services/copilot.ts)
2. Stream events to the execution screen component (src/screens/execute.tsx)
3. Display real-time progress indicators for each task (e.g., "Installing dependencies...", "Running tests...", "Generating code...")
4. Show estimated completion percentages based on event data

Benefit

• Better UX: Users see what Copilot is actively doing instead of staring at a blank "In Progress" spinner
• Debugging: When tasks fail, users can see exactly where execution stopped
• Transparency: Token usage and performance data help users understand costs
• Trust: Real-time feedback builds confidence that the system is working

Acceptance Criteria

• Session event subscription implemented in src/services/copilot.ts using SDK's event API
• Event stream plumbed to src/screens/execute.tsx (via React state or context)
• Execution screen displays at least 3 types of events: task start, progress updates, and tool.execution_complete
• Event log is scrollable and shows timestamps
• Error events are highlighted in red and include actionable messages
• Unit tests verify event handlers properly parse SDK event payloads
• Documentation updated to explain the event monitoring feature

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