test(patrol): add unit tests for patrol.go

Add tests for:
- extractPatrolRole() - various title format cases
- PatrolDigest struct - date format and field access
- PatrolCycleEntry struct - field access

Covers pure functions; bd-dependent functions would need mocking.

Fixes: gt-bm9nx5

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

internal/cmd/patrol_test.go

@@ -0,0 +1,101 @@
+package cmd
+
+import (
+	"testing"
+)
+
+func TestExtractPatrolRole(t *testing.T) {
+	tests := []struct {
+		name     string
+		title    string
+		expected string
+	}{
+		{
+			name:     "deacon patrol",
+			title:    "Digest: mol-deacon-patrol",
+			expected: "deacon",
+		},
+		{
+			name:     "witness patrol",
+			title:    "Digest: mol-witness-patrol",
+			expected: "witness",
+		},
+		{
+			name:     "refinery patrol",
+			title:    "Digest: mol-refinery-patrol",
+			expected: "refinery",
+		},
+		{
+			name:     "wisp digest without patrol suffix",
+			title:    "Digest: gt-wisp-abc123",
+			expected: "patrol",
+		},
+		{
+			name:     "random title",
+			title:    "Some other digest",
+			expected: "patrol",
+		},
+		{
+			name:     "empty title",
+			title:    "",
+			expected: "patrol",
+		},
+		{
+			name:     "just digest prefix",
+			title:    "Digest: ",
+			expected: "patrol",
+		},
+		{
+			name:     "mol prefix but no patrol suffix",
+			title:    "Digest: mol-deacon-other",
+			expected: "patrol",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := extractPatrolRole(tt.title)
+			if got != tt.expected {
+				t.Errorf("extractPatrolRole(%q) = %q, want %q", tt.title, got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestPatrolDigestDateFormat(t *testing.T) {
+	// Test that PatrolDigest.Date format is YYYY-MM-DD
+	digest := PatrolDigest{
+		Date:        "2026-01-17",
+		TotalCycles: 5,
+		ByRole:      map[string]int{"deacon": 2, "witness": 3},
+	}
+
+	if digest.Date != "2026-01-17" {
+		t.Errorf("Date format incorrect: got %q", digest.Date)
+	}
+
+	if digest.TotalCycles != 5 {
+		t.Errorf("TotalCycles: got %d, want 5", digest.TotalCycles)
+	}
+
+	if digest.ByRole["deacon"] != 2 {
+		t.Errorf("ByRole[deacon]: got %d, want 2", digest.ByRole["deacon"])
+	}
+}
+
+func TestPatrolCycleEntry(t *testing.T) {
+	entry := PatrolCycleEntry{
+		ID:          "gt-abc123",
+		Role:        "deacon",
+		Title:       "Digest: mol-deacon-patrol",
+		Description: "Test description",
+	}
+
+	if entry.ID != "gt-abc123" {
+		t.Errorf("ID: got %q, want %q", entry.ID, "gt-abc123")
+	}
+
+	if entry.Role != "deacon" {
+		t.Errorf("Role: got %q, want %q", entry.Role, "deacon")
+	}
+}