feat(epic): add Working Model as required section for epics

Epics now require a "Working Model" section in their description,
in addition to "Success Criteria". This provides clear guidance on
HOW the epic will be executed:

- Owner role: Coordinator vs Implementer
- Delegation target: Polecats, crew, external
- Review process: Approval gates

Closes gt-0lp

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

claude-plugin/commands/epic.md

@@ -24,3 +24,25 @@ Manage epics (large features composed of multiple issues).
 4. Auto-close when done: `bd epic close-eligible`
 
 Epics use parent-child dependencies to track subtasks.
+
+## Epic Template Sections
+
+Epics require two sections in their description:
+
+### Success Criteria
+Define high-level criteria for epic completion. What does "done" look like?
+
+### Working Model
+Define HOW the epic will be executed:
+
+- **Owner role**: Is the assignee a Coordinator (decomposes and delegates) or Implementer (does hands-on work)?
+- **Delegation target**: Who does the work? Polecats? Other crew? External contributors?
+- **Review process**: Who approves completed subtasks? What gates must pass?
+
+Example:
+```markdown
+## Working Model
+- **Owner role**: Coordinator - decompose into subtasks and sling to polecats
+- **Delegation target**: Polecat swarm (3-5 workers)
+- **Review process**: Refinery MQ for each subtask, owner approval for epic closure
+```

internal/types/types.go

@@ -34,9 +34,9 @@ type Issue struct {
 	EstimatedMinutes *int   `json:"estimated_minutes,omitempty"`
 
 	// ===== Timestamps =====
-	CreatedAt   time.Time  `json:"created_at"`
-	CreatedBy   string     `json:"created_by,omitempty"` // Who created this issue (GH#748)
-	UpdatedAt   time.Time  `json:"updated_at"`
+	CreatedAt       time.Time  `json:"created_at"`
+	CreatedBy       string     `json:"created_by,omitempty"` // Who created this issue (GH#748)
+	UpdatedAt       time.Time  `json:"updated_at"`
 	ClosedAt        *time.Time `json:"closed_at,omitempty"`
 	CloseReason     string     `json:"close_reason,omitempty"`      // Reason provided when closing
 	ClosedBySession string     `json:"closed_by_session,omitempty"` // Claude Code session that closed this issue
@@ -560,6 +560,7 @@ func (t IssueType) RequiredSections() []RequiredSection {
 	case TypeEpic:
 		return []RequiredSection{
 			{Heading: "## Success Criteria", Hint: "Define high-level success criteria"},
+			{Heading: "## Working Model", Hint: "Owner role (coordinator/implementer), delegation target, review process"},
 		}
 	default:
 		// Chore and custom types have no required sections
@@ -667,7 +668,7 @@ type IssueWithCounts struct {
 // Used for JSON serialization in bd show and RPC responses.
 type IssueDetails struct {
 	Issue
-	Labels       []string                      `json:"labels,omitempty"`
+	Labels       []string                       `json:"labels,omitempty"`
 	Dependencies []*IssueWithDependencyMetadata `json:"dependencies,omitempty"`
 	Dependents   []*IssueWithDependencyMetadata `json:"dependents,omitempty"`
 	Comments     []*Comment                     `json:"comments,omitempty"`
@@ -690,10 +691,10 @@ const (
 	DepDiscoveredFrom DependencyType = "discovered-from"
 
 	// Graph link types
-	DepRepliesTo  DependencyType = "replies-to"  // Conversation threading
-	DepRelatesTo  DependencyType = "relates-to"  // Loose knowledge graph edges
-	DepDuplicates DependencyType = "duplicates"  // Deduplication link
-	DepSupersedes DependencyType = "supersedes"  // Version chain link
+	DepRepliesTo  DependencyType = "replies-to" // Conversation threading
+	DepRelatesTo  DependencyType = "relates-to" // Loose knowledge graph edges
+	DepDuplicates DependencyType = "duplicates" // Deduplication link
+	DepSupersedes DependencyType = "supersedes" // Version chain link
 
 	// Entity types (HOP foundation - Decision 004)
 	DepAuthoredBy DependencyType = "authored-by" // Creator relationship
@@ -820,14 +821,14 @@ type Comment struct {
 
 // Event represents an audit trail entry
 type Event struct {
-	ID        int64      `json:"id"`
-	IssueID   string     `json:"issue_id"`
-	EventType EventType  `json:"event_type"`
-	Actor     string     `json:"actor"`
-	OldValue  *string    `json:"old_value,omitempty"`
-	NewValue  *string    `json:"new_value,omitempty"`
-	Comment   *string    `json:"comment,omitempty"`
-	CreatedAt time.Time  `json:"created_at"`
+	ID        int64     `json:"id"`
+	IssueID   string    `json:"issue_id"`
+	EventType EventType `json:"event_type"`
+	Actor     string    `json:"actor"`
+	OldValue  *string   `json:"old_value,omitempty"`
+	NewValue  *string   `json:"new_value,omitempty"`
+	Comment   *string   `json:"comment,omitempty"`
+	CreatedAt time.Time `json:"created_at"`
 }
 
 // EventType categorizes audit trail events
@@ -878,17 +879,17 @@ type MoleculeProgressStats struct {
 
 // Statistics provides aggregate metrics
 type Statistics struct {
-	TotalIssues              int     `json:"total_issues"`
-	OpenIssues               int     `json:"open_issues"`
-	InProgressIssues         int     `json:"in_progress_issues"`
-	ClosedIssues             int     `json:"closed_issues"`
-	BlockedIssues            int     `json:"blocked_issues"`
-	DeferredIssues           int     `json:"deferred_issues"`  // Issues on ice
-	ReadyIssues              int     `json:"ready_issues"`
-	TombstoneIssues          int     `json:"tombstone_issues"` // Soft-deleted issues
-	PinnedIssues             int     `json:"pinned_issues"`    // Persistent issues
-	EpicsEligibleForClosure  int     `json:"epics_eligible_for_closure"`
-	AverageLeadTime          float64 `json:"average_lead_time_hours"`
+	TotalIssues             int     `json:"total_issues"`
+	OpenIssues              int     `json:"open_issues"`
+	InProgressIssues        int     `json:"in_progress_issues"`
+	ClosedIssues            int     `json:"closed_issues"`
+	BlockedIssues           int     `json:"blocked_issues"`
+	DeferredIssues          int     `json:"deferred_issues"` // Issues on ice
+	ReadyIssues             int     `json:"ready_issues"`
+	TombstoneIssues         int     `json:"tombstone_issues"` // Soft-deleted issues
+	PinnedIssues            int     `json:"pinned_issues"`    // Persistent issues
+	EpicsEligibleForClosure int     `json:"epics_eligible_for_closure"`
+	AverageLeadTime         float64 `json:"average_lead_time_hours"`
 }
 
 // IssueFilter is used to filter issue queries
@@ -897,11 +898,11 @@ type IssueFilter struct {
 	Priority    *int
 	IssueType   *IssueType
 	Assignee    *string
-	Labels      []string  // AND semantics: issue must have ALL these labels
-	LabelsAny   []string  // OR semantics: issue must have AT LEAST ONE of these labels
+	Labels      []string // AND semantics: issue must have ALL these labels
+	LabelsAny   []string // OR semantics: issue must have AT LEAST ONE of these labels
 	TitleSearch string
-	IDs         []string  // Filter by specific issue IDs
-	IDPrefix    string    // Filter by ID prefix (e.g., "bd-" to match "bd-abc123")
+	IDs         []string // Filter by specific issue IDs
+	IDPrefix    string   // Filter by ID prefix (e.g., "bd-" to match "bd-abc123")
 	Limit       int
 
 	// Pattern matching
@@ -990,12 +991,12 @@ func (s SortPolicy) IsValid() bool {
 // WorkFilter is used to filter ready work queries
 type WorkFilter struct {
 	Status     Status
-	Type       string     // Filter by issue type (task, bug, feature, epic, merge-request, etc.)
+	Type       string // Filter by issue type (task, bug, feature, epic, merge-request, etc.)
 	Priority   *int
 	Assignee   *string
-	Unassigned bool       // Filter for issues with no assignee
-	Labels     []string   // AND semantics: issue must have ALL these labels
-	LabelsAny  []string   // OR semantics: issue must have AT LEAST ONE of these labels
+	Unassigned bool     // Filter for issues with no assignee
+	Labels     []string // AND semantics: issue must have ALL these labels
+	LabelsAny  []string // OR semantics: issue must have AT LEAST ONE of these labels
 	Limit      int
 	SortPolicy SortPolicy
 

internal/types/types_test.go

@@ -579,7 +579,7 @@ func TestIssueTypeRequiredSections(t *testing.T) {
 		{TypeBug, 2, "## Steps to Reproduce"},
 		{TypeFeature, 1, "## Acceptance Criteria"},
 		{TypeTask, 1, "## Acceptance Criteria"},
-		{TypeEpic, 1, "## Success Criteria"},
+		{TypeEpic, 2, "## Success Criteria"},
 		{TypeChore, 0, ""},
 		// Gas Town types are now custom and have no required sections
 		{IssueType("message"), 0, ""},

internal/validation/template_test.go

@@ -97,19 +97,34 @@ Widget displays correctly`,
 
 		// Epic type tests
 		{
-			name:      "epic with success criteria",
+			name:      "epic with all sections",
 			issueType: types.TypeEpic,
 			description: `Big project
 
 ## Success Criteria
 - Project ships
-- Users happy`,
+- Users happy
+
+## Working Model
+- Owner role: Coordinator
+- Delegation target: Polecats
+- Review process: Refinery MQ`,
 			wantErr: false,
 		},
 		{
-			name:        "epic missing success criteria",
+			name:        "epic missing all sections",
 			issueType:   types.TypeEpic,
 			description: "Do everything",
+			wantErr:     true,
+			wantMissing: 2,
+		},
+		{
+			name:      "epic missing working model",
+			issueType: types.TypeEpic,
+			description: `Big project
+
+## Success Criteria
+- Project ships`,
 			wantErr:     true,
 			wantMissing: 1,
 		},