chore: pin test VS Code version and add .gitignore trailing newline (#20)

Addresses review nits from #19:
- Pin `version` in .vscode-test.mjs to 1.101.0 (the minimum declared in
  engines.vscode) instead of `stable`. Tests now run against the floor the
  extension claims to support, and CI is not silently affected by
  stable-channel VS Code updates. Verified: downloads 1.101.0 and the suite
  passes (2 passing, 13 pending, 0 failing).
- Add the missing trailing newline to .gitignore.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: paxcalpt

.gitignore

@@ -4,4 +4,4 @@ CLAUDE.md
 
 # Test runner downloads and compiled test output
 .vscode-test/
-out/
+out/

.vscode-test.mjs

@@ -3,7 +3,10 @@ import { defineConfig } from '@vscode/test-cli';
 export default defineConfig({
 	label: 'unitTests',
 	files: 'out/test/**/*.test.js',
-	version: 'stable',
+	// Pin to the minimum supported VS Code (matches engines.vscode in
+	// package.json) so tests run against the floor we claim to support and
+	// CI is not silently affected by stable-channel updates.
+	version: '1.101.0',
 	mocha: {
 		ui: 'tdd',
 		timeout: 20000,