feat(MORG-45): update branch PR status in registry during morg status (#33)

When running `morg status`, if a branch has a PR and the PR state has
changed since the last sync (different PR number, status, or merged state),
update the branch entry in branches.json so the registry stays current
without requiring an explicit `morg sync`.

Author: developerdavi

src/commands/status.ts

@@ -9,6 +9,7 @@ import { findBranchCaseInsensitive } from '../utils/ticket';
 import { renderStatus } from '../ui/output';
 import { theme, symbols } from '../ui/theme';
 import { registry } from '../services/registry';
+import { ghPrToPrStatus } from '../integrations/providers/github/github-client';
 
 async function runStatusDetail(targetBranch: string, projectId: string): Promise<void> {
   const [branchesFile, projectConfig] = await Promise.all([
@@ -38,6 +39,25 @@ async function runStatusDetail(targetBranch: string, projectId: string): Promise
     execa('git', ['diff', '--stat', `${defaultBranch}...HEAD`], { reject: false }),
   ]);
 
+  // Update registry with latest PR status while we have the data
+  if (trackedBranch && prResult.status === 'fulfilled' && prResult.value) {
+    const pr = prResult.value;
+    const prStatus = ghPrToPrStatus(pr);
+    const branchStatus = pr.mergedAt ? ('pr_merged' as const) : ('pr_open' as const);
+    if (
+      trackedBranch.prNumber !== pr.number ||
+      trackedBranch.prStatus !== prStatus ||
+      trackedBranch.status !== branchStatus
+    ) {
+      trackedBranch.prNumber = pr.number;
+      trackedBranch.prUrl = pr.url;
+      trackedBranch.prStatus = prStatus;
+      trackedBranch.status = branchStatus;
+      trackedBranch.updatedAt = new Date().toISOString();
+      await configManager.saveBranches(projectId, branchesFile);
+    }
+  }
+
   const lines: string[] = [];
 
   lines.push(`${theme.primaryBold('Branch:')} ${targetBranch}`);