Remove accidentally committed files from misnamed .gitignore

- Remove BCS/ symlink hierarchy (generated on-demand)
- Remove .gudang/ archive directory (internal planning docs)
- Remove CLAUDE.md (project instructions, gitignored)
- Remove generated BASH-CODING-STANDARD variants (abstract/summary)

These files were committed when .gitignore was temporarily misnamed.
.gitignore has been restored and these files are now properly ignored.

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

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

Author: Test User