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/cmd/convoy.go

@@ -78,6 +78,7 @@ var (
 	convoyCloseReason  string
 	convoyCloseNotify  string
 	convoyCheckDryRun  bool
+	convoyEpic         string // --epic: link convoy to parent epic (Goals layer)
 )
 
 var convoyCmd = &cobra.Command{