feat(tree): Implement advanced tree & graph network visualization engine

[ziuus]

Feature Request: Advanced Tree & Graph Network Structure Engine

Overview

Upgrade the Goal Tree view with a dynamic, interactive DAG (Directed Acyclic Graph) & node-graph visualizer to support multi-parent prerequisite networks, pan/zoom canvas controls, and advanced spatial layout algorithms.

Key Proposed Features

1. Dynamic DAG / Graph Layout Engine

   • Upgrade beyond fixed 2-column spine connectors to a dynamic node-graph visualization (e.g. SVG/Canvas DAG layout).
   • Support non-linear goal prerequisites (e.g. Goal A connects to both Goal B and Goal C as requirements).

2. Canvas Navigation Controls

   • Interactive Canvas navigation with smooth Pan & Zoom.
   • Expandable and collapsible sub-branches.

3. Spatial Drag & Drop & Node Controls

   • Interactive node positioning or toggleable auto-align layouts.
   • Dynamic node badges showing status (Pending, In-Progress, Done, Blocked).
   • Inline node edit controls (Rename, Add sub-task, Delete).

4. Bi-Directional MCP & Local File Sync

   • Maintain 100% data schema compatibility with ~/.journey/data/roadmap.json and journey-mcp.