Fix shallow clone deepening hanging in CI (#36)

* Fix shallow clone deepening hanging in CI

execSync with stdio: "pipe" created a pipe for stdin, causing git to
hang if a credential helper tried to prompt for input. Additionally,
execSync blocks the event loop, so the global setTimeout timeout could
never fire — leaving no safety net for hanging fetches.

Fix by setting stdin to "ignore" (so git can't block on input) and
adding a 30s timeout directly on execSync (enforced at OS level via
SIGTERM, independent of the event loop).

Fixes LIN-62864

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Log error

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: axelniklasson

src/git.ts

@@ -227,13 +227,14 @@ export function ensureCommitAvailable(sha: string, cwd: string = process.cwd()):
   for (const { command, label } of strategies) {
     verbose(label);
     try {
-      execSync(command, { cwd, stdio: "pipe" });
+      execSync(command, { cwd, stdio: ["ignore", "ignore", "pipe"], timeout: 30_000 });
       if (commitExists(sha, cwd)) {
         verbose(`Found commit ${sha}`);
         return;
       }
-    } catch {
-      // Strategy failed, try next
+    } catch (e) {
+      const reason = e instanceof Error ? e.message : String(e);
+      verbose(`Strategy "${label}" failed: ${reason}`);
     }
   }