Markdown rendering breaks when code blocks contain angle brackets (<>)

[dndgus482]

Description

When using task-master show <id>, the markdown rendering in the "Implementation Details" box breaks if the details field contains angle brackets (<, >) inside fenced code blocks.

Steps to Reproduce

1. Create a task with details containing code blocks with JSX/HTML-like syntax:

{
  "details": "## Implementation\n\n```tsx\nexport function Component() {\n  return <Navigate to=\"/\" replace />\n}\n```"
}

2. Run task-master show <id>

3. Observe: entire Implementation Details section renders as a single line without proper formatting

Expected Behavior

Markdown should render correctly with proper line breaks and formatting. Code blocks should display their contents as-is, including angle brackets.

Actual Behavior

When < characters exist inside code blocks, the entire section renders as one continuous line:

## Current State The PRD mentions `RequireGuest` route guard but it may not be fully implemented...

Instead of properly formatted:

## Current State

The PRD mentions `RequireGuest` route guard but it may not be fully implemented...

Analysis

Tested with tasks in the same file:

• Tasks with 0 < in details → renders correctly
• Tasks with < inside code blocks (JSX/TSX) → broken rendering

Workaround

Escaping < as < fixes the rendering, but this shouldn't be necessary inside fenced code blocks.

Environment

• task-master version: 0.40.1
• OS: macOS
• Node: v24.x