chore: gitignore ReScript build artifacts, remove tracked .mjs/.cmi/.cmj

- Add lib/ocaml/, *.mjs, *.cmi, *.cmj, *.cmt, lib/rescript.lock to .gitignore
- Remove 21 tracked build artifacts from git index

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.gitignore

@@ -40,7 +40,13 @@ erl_crash.dump
 
 # ReScript
 /lib/bs/
+/lib/ocaml/
 /.bsb.lock
+*.mjs
+*.cmi
+*.cmj
+*.cmt
+lib/rescript.lock
 
 # Python (SaltStack only)
 __pycache__/