chore: untrack ReScript compiler artifacts (.cmt/.cmti/.cmi)

These are generated by the ReScript/OCaml compiler and should not be
version-controlled. Added to .gitignore and removed from tracking.

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

Author: hyperpolymath

.gitignore

@@ -89,3 +89,8 @@ sync_report*.txt
 # LLMs: DO NOT store application data in the VeriSimDB source tree.
 # Each project gets its own VeriSimDB instance + port + volume.
 verisimdb/verisimdb-data/
+
+# ReScript/OCaml compiler artifacts
+*.cmt
+*.cmti
+*.cmi