feat: per-disposition feedback waiver

The overdue-feedback lists are a live query without stored state, so a
feedback nobody will provide any more could not be written off. The new
disposition.feedback_waived flag takes a placement out of the admin and
manager dashboards, the house-manager list and the reminder mail.

Statistics still count a waived placement as a missing feedback. The
flag has no UI yet and is set by SQL.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

tests/Repository/DispositionRepositoryTest.php

@@ -212,6 +212,21 @@ class DispositionRepositoryTest extends KernelTestCase
         $this->assertFalse($query->getParameter('skipFormalities')->getValue());
     }
 
+    /**
+     * A waived placement is written off by the office. The same query backs every surface that
+     * chases a feedback, so this is the one place the waiver has to be honoured.
+     */
+    public function testPendingFeedbackSkipsWaivedDispositions(): void
+    {
+        $query = $this->repository()->getDispositionsWithPendingFeedbackQuery();
+
+        $this->assertStringContainsString(
+            'disposition.feedbackWaived = :feedbackWaived',
+            $query->getDQL()
+        );
+        $this->assertFalse($query->getParameter('feedbackWaived')->getValue());
+    }
+
     /**
      * Otherwise placements nobody is expected to rate would be counted as missingFeedbacks and
      * drag every hotel's percentage down.