fix(rerun): preserve exit code and escalate auth errors in batch rerun

[crypticsaiyan]

Summary

runTestRerun's pollAccepted hardcoded exitCode: 1 on every ApiError during run polling. The batch aggregator detects auth failures via rerunResults.find(r => r.error?.exitCode === 3). With every error stored as exitCode: 1, auth errors were never escalated and the batch always exited 1 instead of 3.

The sibling function runTestRunAll already had both fixes applied. runTestRerun missed them.

The Fix

• Exit Code Preservation: pollAccepted now stores exitCode: err.exitCode instead of hardcoded 1, so the aggregator sees the real error class from each polling failure.
• Auth Escalation: Added an authErr check before the generic exit-1 throw: any batch member with exitCode: 3 (AUTH_REQUIRED / AUTH_INVALID) escalates the whole batch to exit 3 with an actionable message.
• Idempotency Key Overflow (D4): Initial chunk dispatch now truncates the base key so base + :chunkN never exceeds 256 chars, matching the identical guard already present in the deferred-retry path.

Testing

Added 9 tests to src/commands/test.rerun.spec.ts across three describe blocks:

• [fix-exitcode]: AUTH_REQUIRED escalates to exit 3; RATE_LIMITED and NOT_FOUND remain exit 1 (no spurious escalation)
• [fix-auth-escalation]: auth failure exits 3; mixed pass+auth batch exits 3; non-auth failure exits 1
• [fix-D4]: short key passes through unchanged; 249-char key fits exactly at 256; 256-char key truncated to preserve suffix

Files Changed

• src/commands/test.ts
• src/commands/test.rerun.spec.ts