Update NPM packages

The VS Code extension telemetry needs a application insights as a side dependency.

Author: andyleejordan

.github/copilot-instructions.md

@@ -0,0 +1,11 @@
+# Copilot Instructions for vscode-powershell
+
+## Updating NPM Packages
+
+- Read [docs/development.md](../docs/development.md) "Tracking Upstream Dependencies" first
+- Dependencies are split: `dependencies` + `devDependencies` for build, `optionalDependencies` for lint/test
+- Remember to use `npm install --include=optional` since we also need to update lint and test dependencies
+- The `.npmrc` uses an Azure Artifacts mirror; read its comments for authentication instructions
+- After updating, verify: `npm run compile` (build), `npm run lint` (lint), `npm audit` (security)
+- The ESLint packages (`eslint`, `@eslint/js`, `typescript-eslint`, `eslint-config-prettier`) should be updated together
+- Fix any new lint warnings from updates to ESLint