[Good First Issue] Add real-time progress feedback for batch processing

[mverab]

When running /geo:batch on multiple files, users don't see progress until all files complete.

What's needed:

1. Show progress indicator during batch processing
2. Display "Processing X of Y files..."
3. Show completion status for each file

Example output:

Processing batch (3 files)...
[1/3] pricing.md ✓
[2/3] about.md ✓
[3/3] contact.md ✓

Complete! Results in geo-output/

Resources:

• Current batch command: .claude/commands/geo-batch.md
• Output style: .claude/output-styles/geo-optimizer.md