MAS-WP-0010 finished: email slave role, stub outside master, contract flows, SCP-8

- EmailMode slave role: master-issued case ids, events to the master,
  sends only on instruction or autonomous policy, transfers blocked or to
  a primed webhook, timeouts left to the master; principle 10 refusals
  reported back.
- conformance/flows.json (13 flows) + mas_modes.runner; mas test runs the
  mode corpus (172/172).
- SCP-8 / v0.2 section 7.1: !MODE requests a handoff defined by the mode
  contract. docs/reuse-surface.md.
- Deploy image copies mas_modes (ticket service imports its mailer).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 5787@bnt-lap001
Assistant-Session: 5db26b82-138b-40cc-9856-4d5eb0f752fd

deploy/railiance/Dockerfile

@@ -6,6 +6,7 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-ins
 RUN useradd -r -s /usr/sbin/nologin mas
 COPY mas_core /app/mas_core
 COPY mas_gateway /app/mas_gateway
+COPY mas_modes /app/mas_modes
 COPY examples /app/examples
 COPY experiments/postfix-probe/capture.py /app/capture.py
 COPY integrations /app/integrations