fix(socket-fix): add missing import and fix optional prNumber type

- Add gitDeleteRemoteBranch import to coana-fix.mts
- Fix optional prNumber type handling in ghsa-tracker.mts for exactOptionalPropertyTypes

Author: jdalton

packages/cli/src/commands/fix/coana-fix.mts

@@ -31,6 +31,7 @@ import {
   gitCommit,
   gitCreateBranch,
   gitDeleteBranch,
+  gitDeleteRemoteBranch,
   gitPushBranch,
   gitRemoteBranchExists,
   gitResetAndClean,

packages/cli/src/commands/fix/ghsa-tracker.mts

@@ -70,12 +70,15 @@ export async function markGhsaFixed(
     tracker.fixed = tracker.fixed.filter(r => r.ghsaId !== ghsaId)
 
     // Add new record.
-    tracker.fixed.push({
+    const record: GhsaFixRecord = {
       branch: branch ?? getSocketFixBranchName(ghsaId),
       fixedAt: new Date().toISOString(),
       ghsaId,
-      prNumber,
-    })
+    }
+    if (prNumber !== undefined) {
+      record.prNumber = prNumber
+    }
+    tracker.fixed.push(record)
 
     // Sort by fixedAt descending (most recent first).
     tracker.fixed.sort((a, b) => b.fixedAt.localeCompare(a.fixedAt))