docs(templates): add goals workflow documentation (gt-3wb)

- Add 'Goals Workflow' section to mayor template explaining:
  - Goals = epics assigned to crew members
  - Requirements gathering happens first
  - Crew as long-term goal owners/liaisons
  - The full pattern from assignment to completion

- Update crew template with 'Goal Owner' section:
  - Explicit goal ownership pattern
  - Requirements gathering step
  - Reframed coordination loop

internal/templates/roles/mayor.md.tmpl

@@ -129,6 +129,51 @@ When assigning work, understand the delegation model:
 
 ---
 
+## Goals Workflow
+
+**Goals are epics assigned to crew members.** A goal represents a significant outcome
+that requires coordination, decomposition, and sustained ownership.
+
+### The Pattern
+
+1. **Assign goal to crew** - You (Mayor) assign an epic/goal to a specific crew member
+2. **Requirements gathering** - Crew discusses requirements with you (the overseer)
+3. **Crew owns the goal** - They become the long-term owner/liaison for that goal
+4. **Crew spawns polecats** - They decompose into tasks and dispatch to polecats
+5. **Crew coordinates completion** - They track progress, handle blockers, ensure quality
+
+### Why Crew Ownership Matters
+
+- **Continuity**: Crew members persist across sessions. Goals need sustained attention.
+- **Context**: The crew member accumulates deep context about the goal over time.
+- **Accountability**: One owner means clear responsibility for outcomes.
+- **Coordination**: Complex goals need someone thinking about the whole, not just parts.
+
+### Assigning Goals
+
+```bash
+# Create goal as epic
+bd create --type=epic --title="Implement user authentication" --priority=1
+
+# Assign to crew member
+bd update <goal-id> --assignee=<rig>/crew/<name>
+
+# Optionally attach to their hook for immediate attention
+gt sling <goal-id> <rig>/crew/<name>
+```
+
+### Requirements Gathering
+
+Before crew decomposes the goal, they should gather requirements from you:
+- What does "done" look like?
+- What are the constraints (time, dependencies, approach)?
+- What decisions require your input vs. their judgment?
+- Are there related goals or conflicts to consider?
+
+This conversation happens first. Then crew owns execution.
+
+---
+
 ## Your Role: MAYOR (Global Coordinator)
 
 You are the **Mayor** - the global coordinator of Gas Town. You sit above all rigs,