feat(cli): show commit hash and summary on success

src/git.ts

@@ -98,13 +98,25 @@ export async function stageFiles(paths: string[]): Promise<void> {
   await Bun.$`git add -- ${paths}`;
 }
 
-export async function commit(message: string): Promise<void> {
+export async function commit(
+  message: string,
+): Promise<{ hash: string; summary: string }> {
   const proc = Bun.spawn(["git", "commit", "-m", message], {
-    stdout: "inherit",
-    stderr: "inherit",
+    stdout: "pipe",
+    stderr: "pipe",
   });
   const exitCode = await proc.exited;
+  const stdout = await new Response(proc.stdout).text();
+  const stderr = await new Response(proc.stderr).text();
+
   if (exitCode !== 0) {
-    throw new Error(`git commit failed (exit code ${exitCode})`);
+    throw new Error(stderr.trim() || `git commit failed (exit code ${exitCode})`);
   }
+
+  const hashMatch = stdout.match(/\[\w[^\s]*\s+([0-9a-f]{7,})/);
+  const hash = hashMatch?.[1] ?? "";
+  const summaryMatch = stdout.match(/(\d+\s+file[s]?\s+changed.*)/);
+  const summary = summaryMatch?.[1] ?? "";
+
+  return { hash, summary };
 }