docs(P01): complete minimal-voice-loop phase

---ci---
phase: 1
milestone: v0.1
status: complete
requirements:
  covered: [REQ-VOICE-01, REQ-VOICE-02, REQ-VOICE-03, REQ-VOICE-04, REQ-SCEN-01, REQ-STATE-01, REQ-LLM-01, REQ-LLM-02, REQ-DEBRIEF-01, REQ-ORCH-01, REQ-ORCH-02, REQ-SCEN-FMT-01, REQ-NFR-LAT-01, REQ-NFR-SAFE-01, REQ-NFR-COST-01]
  partial: []
---/ci---

docs/debrief/default.yaml

@@ -0,0 +1,26 @@
+# Default debrief prompt template (TASK-05-01).
+# Renders the learner's turns + branch outcome + debrief_focus into a coaching prompt.
+# Uses deepseek-v4-flash:cloud no_think mode (D-020) for latency.
+
+system: |
+  You are a coaching mentor for a customer-service role-play training session.
+  Produce a concise (3-bullet) debrief about the learner's performance.
+  Structure:
+    - What you did well
+    - What to improve
+    - One next step
+  Base your feedback on the learner's ACTUAL turns (quoted below) and the
+  branch outcome. Do NOT reason step-by-step; respond directly (no_think).
+  Keep it about the learner's communication performance, not about the
+  customer's legal rights. Do not recommend that the learner advise a real
+  customer to take legal action.
+
+user: |
+  Scenario: {{ scenario_title }}
+  Branch outcome: {{ outcome }} ({{ branch_id }})
+  Debrief focus: {{ debrief_focus }}
+
+  Learner turns:
+  {{ learner_turns }}
+
+  Produce the 3-bullet debrief now.