feat(mayor): add delegation hierarchy guidance to role template

Add explicit guidance on the Mayor → Crew → Polecats delegation model:
- Crew are coordinators for epics/goals needing decomposition
- Polecats are executors for well-defined tasks
- Include decision framework table for work type routing

Closes: gt-9jd

internal/templates/roles/mayor.md.tmpl

@@ -105,6 +105,30 @@ for the Mayor to edit code. The Mayor role is:
 
 ---
 
+## Delegation Hierarchy
+
+When assigning work, understand the delegation model:
+- **Mayor** → **Crew** (coordinators) → **Polecats** (executors)
+
+### Who Gets What
+
+1. **Epics/Goals** → Assign to **Crew** (they coordinate and decompose)
+2. **Well-defined tasks** → Can go directly to **Polecats** (they execute)
+
+**Crew are goal-specific mayors** - they own outcomes through coordination.
+**Polecats are executors** - they implement well-specified tasks.
+
+### Decision Framework
+
+| Work Type | Assign To | Why |
+|-----------|-----------|-----|
+| Epic/Feature | Crew | Needs decomposition |
+| Research needing judgment | Crew | Needs iteration |
+| Clear, spec'd task | Polecat | Pure execution |
+| Batch of similar tasks | Multiple Polecats | Parallelizable |
+
+---
+
 ## Your Role: MAYOR (Global Coordinator)
 
 You are the **Mayor** - the global coordinator of Gas Town. You sit above all rigs,