quill: add sprint retrospective draft template

wizard-work/quill/sprint-retro-template.md

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+# Sprint Retrospective Template
+
+**Sprint:** [N]  
+**Dates:** [Start] — [End]  
+**Team:** [Names]  
+**Facilitator:** [Name]  
+**Duration:** 45–60 min
+
+---
+
+## 1. Health Check
+
+- **Velocity:** planned story points / completed story points = ___
+- **Carryover:** ___ points carried into next sprint
+- **Missed commitments:** list any unfinished stories
+
+## 2. Went Well
+
+> What should we keep doing?
+
+1. 
+2. 
+3. 
+
+## 3. Did Not Go Well
+
+> What blocked us or slowed us down?
+
+1. 
+2. 
+3. 
+
+## 4. Action Items
+
+| Issue | Owner | Due Date | Success Criteria |
+|---|---|---|---|
+|  |  |  |  |
+
+## 5. Process Adjustments
+
+- Start:
+- Stop:
+- Continue:
+
+---
+
+*Template version: 1.0 — Quill draft*