fix(spawn): use detached:true so children are immune to terminal SIGINT

Children now get their own process group. Terminal Ctrl+C only reaches
the parent, which then does orderly tree-kill while children are still
alive and the process tree is intact.

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@push.rocks/smartshell",
   "private": false,
-  "version": "3.3.3",
+  "version": "3.3.5",
   "description": "A library for executing shell commands using promises.",
   "main": "dist_ts/index.js",
   "typings": "dist_ts/index.d.ts",
@@ -33,14 +33,14 @@
   },
   "homepage": "https://code.foss.global/push.rocks/smartshell",
   "devDependencies": {
-    "@git.zone/tsbuild": "^2.6.4",
-    "@git.zone/tsrun": "^1.3.3",
-    "@git.zone/tstest": "^2.3.2",
-    "@types/node": "^22.10.2"
+    "@git.zone/tsbuild": "^2.7.3",
+    "@git.zone/tsrun": "^1.6.2",
+    "@git.zone/tstest": "^2.8.3",
+    "@types/node": "^22.19.13"
   },
   "dependencies": {
-    "@push.rocks/smartdelay": "^3.0.1",
-    "@push.rocks/smartexit": "^2.0.0",
+    "@push.rocks/smartdelay": "^3.0.5",
+    "@push.rocks/smartexit": "^2.0.1",
     "@push.rocks/smartpromise": "^4.2.3",
     "@types/which": "^3.0.4",
     "tree-kill": "^1.2.2",

ts/classes.smartshell.ts

@@ -119,7 +119,7 @@ export class Smartshell {
       shell: false, // SECURITY: Never use shell with untrusted input
       cwd: process.cwd(),
       env: options.env || process.env,
-      detached: false,
+      detached: true, // Own process group — immune to terminal SIGINT, managed by smartexit
       signal: options.signal,
     });
 
@@ -342,7 +342,7 @@ export class Smartshell {
       shell: true,
       cwd: process.cwd(),
       env: options.env || process.env,
-      detached: false,
+      detached: true, // Own process group — immune to terminal SIGINT, managed by smartexit
       signal: options.signal,
     });