feat: Add agent column to logs output and update table header style

[Copilot]

Overview

This PR enhances the logs command output by adding an "Agent" column that displays the agentic engine ID for each workflow run, and updates the table header styling for better visual clarity.

Changes

1. Added Agent Column

The logs table now includes an "Agent" column positioned after the "Workflow" column that displays the engine ID (e.g., claude, codex, copilot) for each workflow run. The engine ID is automatically extracted from the aw_info.json file in each run's log directory.

Example output:

Run ID | Workflow          | Agent   | Status  | Duration | Tokens | Cost ($)
------ | ----------------- | ------- | ------- | -------- | ------ | --------
123456 | daily-doc-updater | claude  | success | 5m30s    | 15k    | $0.045
123457 | ci-doctor         | codex   | success | 3m15s    | 8.5k   | $0.028
123458 | audit-workflows   | copilot | failure | 2m10s    | 5.2k   | $0.016

This makes it easy to see which AI engine was used for each workflow execution at a glance, helping with analysis and debugging.

2. Updated Table Header Style

Table headers have been updated from white text on a dark background to grey text with no background:

• Before: #FFFFFF (white) foreground with #34374A (dark grey) background
• After: #6272A4 (grey) foreground with no background

This provides a cleaner, more subtle appearance that improves readability and visual hierarchy.

Visual Demonstration

The screenshot shows:

• Side-by-side comparison of the old and new table header styles
• The new Agent column properly positioned after the Workflow column
• Full output example with multiple workflow runs showing different engines

Technical Details

Files Modified:

• pkg/cli/logs_report.go - Added Agent field to RunData struct and extraction logic in buildLogsData()
• pkg/cli/logs_report_test.go - Updated test data to include Agent field
• pkg/console/console.go - Updated tableHeaderStyle to use grey foreground without background

Implementation:

• The Agent field uses the omitempty tag to gracefully handle cases where aw_info.json is not available
• Engine ID extraction reuses the existing parseAwInfo() function for consistency
• All changes maintain backward compatibility with existing logs

Testing

• ✅ All unit tests passing
• ✅ Linter validation passed
• ✅ Build successful
• ✅ Manual verification with sample data completed

Original prompt

• In the "logs" command output, add a "agent" column that shows the agentic engine id (claude, codex, copilot, ...). Place it after "workflow" column
• update table heade style to no background, grey foreground.

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