fix: add compiled installer dist so CLI installation works

The bootstrap script (install.sh) fetches installer/dist/index.js from
main, but it was never committed due to the global dist/ gitignore rule.
Added negation rule and the compiled installer bundle.

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

.gitignore

@@ -1,6 +1,7 @@
 datasets/
 node_modules/
 dist/
+!installer/dist/
 *.log
 .DS_Store
 .env