chore: drop .gitignore entry for truecourse

Not using the tool, removed its output dir too.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: r4topunk

.gitignore

@@ -3,9 +3,6 @@
 # worktrees
 .worktrees/
 
-# truecourse analyzer output
-.truecourse/
-
 # dependencies
 /node_modules
 /.pnp