Add author metadata and exclude non-essential files from crate package

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

Author: mingjerli

Cargo.toml

@@ -2,12 +2,14 @@
 name = "brick-text-builder-tui"
 version = "0.1.0"
 edition = "2021"
+authors = ["Ming Jer Lee <mingjerli@users.noreply.github.com>"]
 description = "Render text as brick art with Unicode box-drawing characters — CLI and TUI"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/mingjerli/brick-text-builder-tui"
 readme = "README.md"
 keywords = ["cli", "tui", "ascii-art", "terminal", "ratatui"]
 categories = ["command-line-utilities", "visualization"]
+exclude = [".github/", "demo/", "demo.sh"]
 
 [[bin]]
 name = "bricktext"