Policies tidying (#6587)

# Description of Changes
* Improve typing of API (breaking change but unreleased, frontend also
updated in this PR)
* Add ownership concept to policies
* De-AI the comments
* Update the `task dev:saas` rule to spawn the engine as well

.taskfiles/backend.yml

@@ -18,6 +18,15 @@ version: '3'
 tasks:
   dev:
     desc: "Start backend dev server"
+    cmds:
+      - task: dev:proprietary
+        vars:
+          PORT: '{{.PORT}}'
+          AIENGINE_URL: '{{.AIENGINE_URL}}'
+          AIENGINE_TIMEOUTSECONDS: '{{.AIENGINE_TIMEOUTSECONDS}}'
+
+  dev:proprietary:
+    desc: "Start backend dev server in proprietary mode"
     ignore_error: true
     vars:
       PORT: '{{.PORT | default "8080"}}'
@@ -50,9 +59,14 @@ tasks:
       PORT: '{{.PORT | default "8080"}}'
       # Override to "" to run the pure `saas` profile against your own SAAS_DB_*.
       PROFILES: '{{.PROFILES | default "dev"}}'
+      AIENGINE_URL: '{{.AIENGINE_URL | default ""}}'
+      AIENGINE_TIMEOUTSECONDS: '{{.AIENGINE_TIMEOUTSECONDS | default "120"}}'
     env:
       SERVER_PORT: '{{.PORT}}'
       STIRLING_FLAVOR: saas
+      AIENGINE_URL: '{{.AIENGINE_URL}}'
+      AIENGINE_ENABLED: '{{if .AIENGINE_URL}}true{{else}}false{{end}}'
+      AIENGINE_TIMEOUTSECONDS: '{{.AIENGINE_TIMEOUTSECONDS}}'
     cmds:
       - cmd: cmd /c ".\gradlew.bat :stirling-pdf:bootRun {{if .PROFILES}}--args=\"--spring.profiles.include={{.PROFILES}}\"{{end}}"
         platforms: [windows]