Add persistent Boat computer environments and runner ownership

Introduce company-scoped computer attachments, bounded runner and viewer ownership, persistent files and worktrees, Boat ingress, and native and legacy runtime integration behind the experimental Boat flag. Keep desktop UI and extended acceptance cases in the stacked feature branch.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/shared/src/validators/instance.ts

@@ -40,6 +40,7 @@ export const patchInstanceGeneralSettingsSchema = z
 
 export const instanceExperimentalSettingsSchema = z.object({
   enableEnvironments: z.boolean().default(false),
+  enableBoatEnvironments: z.boolean().default(false),
   enableNativeRunner: z.boolean().default(true),
   enableAiConnectionRouters: z.boolean().default(false),
   enableManagedSandboxOnly: z.boolean().default(false),