Prepare cladm for npm publishing

Add files field, author, repository, and engines to package.json. Add
.npmignore, MIT LICENSE file, GitHub Actions publish workflow on v* tags,
and update README install section with bun install -g / bunx instructions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.npmignore

@@ -0,0 +1,9 @@
+site/
+docs/
+tmp/
+assets/
+node_modules/
+*.lock
+.claude/
+CLAUDE.md
+human-mouse.js