fix: exit with error when agent job status is failed

[flcrom]

firecrawl agent <jobId> on a job that already failed printed {"success":true,"status":"failed","data":null} and exited 0, so the server's error was lost. The --wait path already returns the failure with the error; this makes the plain status check do the same: exit 1 with the server's error, or "Agent failed" if none is sent. Completed, processing and cancelled are unchanged.

This covers the remaining non-wait case of #115, it doesn't close the whole issue.

Added agent-status.test.ts (6 cases against a local HTTP fixture). The failed-status case fails on current main. pnpm test, type-check and format:check pass locally.

AI help was used for this change.

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Summary by cubic

Makes firecrawl agent <jobId> exit 1 when an already-failed job is checked, matching the --wait path so the server's error isn't lost.

• Prints the server's error to stderr, or "Agent failed" when the server sends none.
• Completed, processing, and cancelled statuses are unchanged.
• Adds agent-status.test.ts covering exit codes across all statuses, empty/missing errors, and HTTP rejection cases.

^{Written for commit 4746693. Summary will update on new commits.}

[cubic-dev-ai]

All reported issues were addressed across 2 files

<sub>Shadow auto-approve: would auto-approve with 2 open P3 issues. Makes the non-wait agent status check exit 1 on failed jobs and surface the server error, matching the existing --wait behavior. Adds fixture-based tests covering exit codes across statuses, keeping the fix bounded and verified.

Fix all with cubic | Re-trigger cubic</sub>

[cubic-dev-ai]

0 issues found across 2 files (changes from recent commits).

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

<sub>Shadow auto-approve: would auto-approve. Fixes firecrawl agent <jobId> to exit 1 and surface the server error for failed jobs, matching the --wait path; other statuses stay unchanged and tests cover the behavior.

Re-trigger cubic</sub>