refactor: update branch naming convention for Kubernetes compatibility (#249)

* refactor: update branch naming convention for Kubernetes compatibility

- Changed timestamp format in branch names to a shorter, Kubernetes-compatible style (lowercase, hyphens only).
- Updated related tests to reflect new branch name format.
- Ensured branch names are limited to a maximum of 50 characters to comply with Kubernetes naming requirements.

* refactor: clean up timestamp formatting in branch naming logic

- Removed unnecessary whitespace and standardized string formatting for the Kubernetes-compatible timestamp in branch names.
- Ensured consistency in the use of double quotes for string literals.

src/github/operations/branch.ts

@@ -86,14 +86,18 @@ export async function setupBranch(
 
   // Generate branch name for either an issue or closed/merged PR
   const entityType = isPR ? "pr" : "issue";
-  const timestamp = new Date()
-    .toISOString()
-    .replace(/[:-]/g, "")
-    .replace(/\.\d{3}Z/, "")
-    .split("T")
-    .join("_");
 
-  const newBranch = `${branchPrefix}${entityType}-${entityNumber}-${timestamp}`;
+  // Create Kubernetes-compatible timestamp: lowercase, hyphens only, shorter format
+  const now = new Date();
+  const timestamp = `${now.getFullYear()}${String(now.getMonth() + 1).padStart(2, "0")}${String(now.getDate()).padStart(2, "0")}-${String(now.getHours()).padStart(2, "0")}${String(now.getMinutes()).padStart(2, "0")}`;
+
+  // Ensure branch name is Kubernetes-compatible:
+  // - Lowercase only
+  // - Alphanumeric with hyphens
+  // - No underscores
+  // - Max 50 chars (to allow for prefixes)
+  const branchName = `${branchPrefix}${entityType}-${entityNumber}-${timestamp}`;
+  const newBranch = branchName.toLowerCase().substring(0, 50);
 
   try {
     // Get the SHA of the source branch to verify it exists