Shorten User policy comments to state what only

Move why explanations to documentation files.
Keep policy comments concise and focused.

lib/accounts/user.ex

@@ -269,46 +269,31 @@ defmodule Mv.Accounts.User do
   # Authorization Policies
   # Order matters: Most specific policies first, then general permission check
   policies do
-    # ASHAUTHENTICATION BYPASS: Allow authentication actions (registration, login)
-    # These actions are called internally by AshAuthentication and need to bypass
-    # normal authorization policies. This must come FIRST because User is an
-    # authentication resource and authentication flows should have priority.
+    # AshAuthentication bypass (registration/login without actor)
     bypass AshAuthentication.Checks.AshAuthenticationInteraction do
       description "Allow AshAuthentication internal operations (registration, login)"
       authorize_if always()
     end
 
-    # SYSTEM OPERATIONS: Allow CRUD operations without actor (TEST ENVIRONMENT ONLY)
-    # In test: All operations allowed (for test fixtures)
-    # In production/dev: ALL operations denied without actor (fail-closed for security)
-    # NoActor.check uses compile-time environment detection to prevent security issues
+    # NoActor bypass (test fixtures only, see no_actor.ex)
     bypass action_type([:create, :read, :update, :destroy]) do
       description "Allow system operations without actor (test environment only)"
       authorize_if Mv.Authorization.Checks.NoActor
     end
 
-    # SPECIAL CASE: Users can always READ their own account
-    # This allows users with ANY permission set to read their own user record
-    # Uses bypass with expr filter to enable auto_filter behavior for reads/lists
-    # (consistent with Member "always read linked member" pattern)
+    # READ bypass for list queries (scope :own via expr)
     bypass action_type(:read) do
       description "Users can always read their own account"
       authorize_if expr(id == ^actor(:id))
     end
 
-    # GENERAL: Check permissions from user's role
-    # HasPermission handles permissions correctly:
-    # - :own_data → can update own user (scope :own)
-    # - :read_only → can update own user (scope :own)
-    # - :normal_user → can update own user (scope :own)
-    # - :admin → can read/create/update/destroy all users (scope :all)
+    # UPDATE/DESTROY via HasPermission (evaluates PermissionSets scope)
     policy action_type([:read, :create, :update, :destroy]) do
       description "Check permissions from user's role and permission set"
       authorize_if Mv.Authorization.Checks.HasPermission
     end
 
-    # DEFAULT: Ash implicitly forbids if no policy authorizes
-    # No explicit forbid needed, as Ash's default behavior is fail-closed
+    # Default: Ash implicitly forbids if no policy authorizes (fail-closed)
   end
 
   # Global validations - applied to all relevant actions