fix: remove 452 entangled verisimdb-data files from tracking

VeriSimDB app data does NOT belong in the source monorepo. Each project
gets its own VeriSimDB instance + port + volume. The standalone
verisimdb-data repo is the correct location. Added .gitignore rule with
explicit warning for LLMs to stop storing app data here.

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

Author: hyperpolymath

.gitignore

@@ -83,3 +83,9 @@ htmlcov/
 ai-cli-crash-capture/
 sync_report*.txt
 .directory
+
+# VeriSimDB app data — belongs in standalone verisimdb-data repo, NOT here.
+# See: https://github.com/hyperpolymath/verisimdb-data
+# LLMs: DO NOT store application data in the VeriSimDB source tree.
+# Each project gets its own VeriSimDB instance + port + volume.
+verisimdb/verisimdb-data/