Add visual progress tracker (terminal-based)

[travisjneuman]

Description

Create a terminal-based progress visualization that shows a learner's completion status across all levels. Could use a simple bar chart or grid display using ASCII art or the rich library.

Example Output

Level 00 [===============] 15/15
Level  0 [========       ]  8/15
Level  1 [               ]  0/15
...

Acceptance Criteria

• Reads completion data from PROGRESS.md or a JSON progress file
• Displays progress for all 13 levels and expansion modules
• Works on Windows, macOS, and Linux terminals
• Lives in tools/ directory

[travisjneuman]

Resolved in 36dceb1: Complete dashboard overhaul — tools/dashboard.py now parses PROGRESS.md checkboxes, shows ASCII progress bars per level, cross-platform safe. PROGRESS.md expanded with individual project checkboxes.