docs(cli): document oneshot usage reports

[r266-tech]

Summary

Document hermes -z --usage-file <path> in the CLI guide and zh-Hans mirror.

This flag was added for one-shot automation so batch callers can capture JSON usage data without scraping terminal output. The new docs show the command and summarize the report fields: estimated cost, token counts, model/provider, API call count, and completion/failure status.

Checks

• Source-checked hermes_cli/_parser.py and hermes_cli/oneshot.py
• Docs-only change

[GottZ]

This was generated by AI during triage.

Summary

Two PRs address the same one-shot usage-report feature: #59615 implements the --usage-file JSON reporting path, while #59901 documents that behavior in the English CLI guide and its zh-Hans mirror.

Related pull requests

• #59615 [merged] related — (+133/-0) — merged reference implementation: adds --usage-file, threads it through both one-shot dispatch paths, writes best-effort JSON reports on success and failure, and adds focused tests. It remains relevant because #59901 documents this merged behavior.
• #59901 related — (+9/-3) — merge: documents the implemented hermes -z --usage-file <path> workflow and its report fields in both the English CLI guide and zh-Hans mirror, without changing runtime behavior.

Suggested consolidation

Merge #59901 as the documentation follow-up to the already merged implementation in #59615; the PRs are complementary, so neither should be closed as a duplicate.

Cross-PR triage: Reviewed 2 pull requests and 0 issues in this complex. Each diff was read against this issue; Assessment working set: 12 kB of PR diffs, 2 kB of issue/PR text, 0 verify verdicts. verdicts reflect diff content, not PR titles. Part of an automated triage batch.