Docs: import-format guide references RANK_SPEC.md, which is unreachable via guide show/list

[johnjosephhorton]

Summary

The import-format guide references RANK_SPEC.md for the full rank-battery import/validation flow, but that document is not reachable through the documented mechanism (zwill guide show) and does not appear in zwill guide list.

Repro

zwill guide show import-format includes:

A rank battery is a set of per-item questions scored together … See RANK_SPEC.md for the full rank flow.

But:

zwill guide list
#  -> only: agent-workflow, interpreting-results, import-format

zwill guide show RANK_SPEC
# {
#   "status": "error",
#   "errors": [{ "code": "not_found",
#     "message": "Unknown zwill guide: RANK_SPEC.",
#     "context": { "known_guides": ["agent-workflow","import-format","interpreting-results"] } }]
# }

Impact

The canonical rank-battery import shape (how _RANK / _GROUP columns map to rank_task_id, expected answer encoding, direction) is effectively undocumented. I had to infer it and rely on the auto-detector. (The auto-detector did work well — it grouped the 4 batteries and inferred 1_is_best — but the reference doc it points you to is a dead link.)

Suggested fixes

• Ship RANK_SPEC as a guide show-able guide (add it to the bundled guides), or
• Replace the reference in import-format with the actual content / a reachable link.