fix: Fix review task completion bug + add initiative-level Request Changes

Critical: review/merge tasks hit an early return in handleTaskCompleted()
that skipped the phase completion check, leaving phases stuck in
in_progress forever. Changed to an if-block wrapping only the merge step.

Also adds requestChangesOnInitiative() which creates/reuses a
"Finalization" phase for initiative-level review feedback, with dedup
guards for both phase and initiative request-changes flows.

apps/web/src/components/review/InitiativeReview.tsx

@@ -1,6 +1,6 @@
 import { useCallback, useMemo, useRef, useState } from "react";
 import { toast } from "sonner";
-import { Loader2, GitBranch, ArrowRight, FileCode, Plus, Minus, Upload, GitMerge } from "lucide-react";
+import { Loader2, GitBranch, ArrowRight, FileCode, Plus, Minus, Upload, GitMerge, RotateCcw } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import { trpc } from "@/lib/trpc";
 import { parseUnifiedDiff } from "./parse-diff";
@@ -82,6 +82,14 @@ export function InitiativeReview({ initiativeId, onCompleted }: InitiativeReview
     onError: (err) => toast.error(`Failed to stop: ${err.message}`),
   });
 
+  const requestChangesMutation = trpc.requestInitiativeChanges.useMutation({
+    onSuccess: () => {
+      toast.success("Changes requested — review task created");
+      onCompleted();
+    },
+    onError: (err) => toast.error(err.message),
+  });
+
   const approveMutation = trpc.approveInitiativeReview.useMutation({
     onSuccess: (_data, variables) => {
       const msg = variables.strategy === "merge_and_push"
@@ -189,6 +197,24 @@ export function InitiativeReview({ initiativeId, onCompleted }: InitiativeReview
           {/* Right: preview + action buttons */}
           <div className="flex items-center gap-2 shrink-0">
             {previewState && <PreviewControls preview={previewState} />}
+            <Button
+              variant="outline"
+              size="sm"
+              onClick={() => {
+                const summary = window.prompt("Describe the changes needed:");
+                if (!summary?.trim()) return;
+                requestChangesMutation.mutate({ initiativeId, summary: summary.trim() });
+              }}
+              disabled={requestChangesMutation.isPending}
+              className="h-8 text-xs px-3 text-status-error-fg border-status-error-border hover:bg-status-error-bg"
+            >
+              {requestChangesMutation.isPending ? (
+                <Loader2 className="h-3 w-3 animate-spin" />
+              ) : (
+                <RotateCcw className="h-3 w-3" />
+              )}
+              Request Changes
+            </Button>
             <Button
               variant="outline"
               size="sm"