docs: Add v1.4.2 review documents and update backlog

- Fix stale docstring in media.py (4096 -> 12000)
- Add developer review document
- Add architect review document
- Update backlog with identified issues

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

starpunk/media.py

@@ -7,7 +7,7 @@ Per ADR-057 and ADR-058:
 - 50MB max upload, 10MB max output (v1.4.0)
 - Image variants: thumb, small, medium, large (v1.4.0)
 - Tiered resize strategy based on input size (v1.4.0)
-- 4096x4096 max dimensions
+- 12000x12000 max dimensions (v1.4.2)
 - 4 images max per note
 """