Ensures Captain follows explicit mandatory-transfer rules from active
Response Guidelines and Guardrails instead of allowing the generic
consent-first fallback to override those rules.
## What changed
- Made explicit transfer requirements take precedence over generic
consent-first handoff defaults only when their condition matches.
- Added explicit Response Guideline and Guardrail transfer rules to the
human-handoff protocol.
- Added focused prompt regression coverage.
## How to reproduce
Configure a Response Guideline or Guardrail that requires immediate
transfer for a specific condition, then send a request matching that
condition. Captain should invoke the human-handoff path without asking
the user to consent again. Unmatched requests continue to use the
existing consent-first fallback.
The assistant prompt renderer, agent prompt context, and focused
regression specs pass locally.
