fix: preserve safe gateway env vars on reinstall (#63136) (thanks @WarrenJones)

* fix(daemon): preserve safe env vars on gateway reinstall

Pass the existing service environment into gateway reinstall planning so safe custom variables survive LaunchAgent rewrites and existing PATH entries are merged instead of being silently dropped.

Made-with: Cursor

* fix(daemon): track managed env keys on reinstall

* fix: preserve safe gateway env vars on reinstall (#63136) (thanks @WarrenJones)

* fix: validate preserved PATH entries on reinstall (#63136) (thanks @WarrenJones)

---------

Co-authored-by: WarrenJones <8704779+WarrenJones@users.noreply.github.com>
Co-authored-by: Ayaan Zaidi <hi@obviy.us>

src/cli/daemon-cli/install.ts

@@ -124,6 +124,7 @@ export async function runDaemonInstall(opts: DaemonInstallOptions) {
     env: installEnv,
     port,
     runtime: runtimeRaw,
+    existingEnvironment: existingServiceEnv,
     warn: (message) => {
       if (json) {
         warnings.push(message);