Improves Captain V1 → V2 migration for complex legacy instructions so
mandatory triggers, workflows, language rules, and escalation behavior
remain active while query-dependent product knowledge is prepared as
pending FAQ candidates.
## What changed
- Added explicit preservation rules for mandatory triggers, verification
steps, escalation conditions, exceptions, and language behavior.
- Added an auditor that checks the draft and fixes any issues before
manual review.
- Kept the existing migration application contract and schema limits
unchanged
- Added focused regression coverage for the complex-prompt classifier
contract.
## How to reproduce
Generate a migration draft for an assistant with dense legacy
instructions containing mandatory handoff triggers, verification rules,
product facts, and multi-step workflows. The resulting draft should keep
actions active, place query-dependent facts in FAQ candidates, and avoid
silently dropping or reversing source requirements.
Focused Captain migration specs and RuboCop checks pass locally.
