test: rebuildable bundles, npm test entry point

- esbuild alias fixed in the session/sysinfo/sftp test commands (they
  could not build at all), .sftp-svc.mjs build documented, real
  connection-stability assertions
- tests/build-bundles.cjs builds every bundle fresh; npm test runs the
  seven offline suites; esbuild pinned in devDependencies
- remove the assertion-less .exact-inline.mjs; ignore/clean test temp dirs

package-lock.json

@@ -7,6 +7,7 @@
     "": {
       "name": "open-terminal",
       "version": "1.0.13",
+      "license": "MIT",
       "dependencies": {
         "@lydell/node-pty": "^1.2.0-beta.15",
         "@xterm/addon-fit": "^0.11.0",
@@ -32,6 +33,7 @@
         "electron": "^44.2.0",
         "electron-builder": "^26.15.3",
         "electron-vite": "^5.0.0",
+        "esbuild": "^0.25.12",
         "typescript": "~5.9.0",
         "vite": "^7.0.0"
       }
@@ -4291,7 +4293,7 @@
     },
     "node_modules/esbuild": {
       "version": "0.25.12",
-      "resolved": "https://registry.npmmirror.com/esbuild/-/esbuild-0.25.12.tgz",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.25.12.tgz",
       "integrity": "sha512-bbPBYYrtZbkt6Os6FiTLCTFxvq4tt3JKall1vRwshA3fdVztsLAatFaZobhkBC8/BrPetoa0oksYoKXoG4ryJg==",
       "dev": true,
       "hasInstallScript": true,