✨ Add VS Code node:test debugging and runner config

launch.json: 'Debug current test file' F5 config running
node --test --strip-types on the active file.

settings.json: register .ts with the connor4312.nodejs-testing
extension via nodejs-testing.extensions, using --strip-types (the
repo pins node >=26 with native type stripping) instead of tsx, so
the extension discovers src/*.test.ts and shows Run/Debug lenses
above test() calls in the native Testing UI.

extensions.json: recommend connor4312.nodejs-testing; cspell.json:
allow 'connor' for the extension id.

.gitignore: un-ignore .vscode/launch.json so the config is shared.

.gitignore

@@ -10,5 +10,6 @@ coverage
 !.vscode/extensions.json
 !.vscode/settings.json
 !.vscode/tasks.json
+!.vscode/launch.json
 .idea
-.DS_Store
+.DS_Store