.claude/launch.json was committed but VS Code reads launch configs from
.vscode/launch.json, so no tool was consuming it. Moved to the correct
location and removed the misplaced file from git tracking.
Also added .vscode/settings.json to .gitignore so local VS Code user
preferences don't end up tracked.
typecheck + 242 tests green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
