Bump version to 4.1.5

Developer documentation release:
- Educational comments throughout core modules
- Pi test automation script
- MOTD improvements with dynamic emojis
- v4.2 wishlist

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "stegasoo"
-version = "4.1.2"
+version = "4.1.5"
 description = "Secure steganography with hybrid photo + passphrase + PIN authentication"
 readme = "README.md"
 license = "MIT"