fix(beads): align agent bead prefixes and force multi-hyphen IDs (#482)

* fix(beads): align agent bead prefixes and force multi-hyphen IDs

* fix(checkpoint): treat threshold as stale at boundary

internal/beads/force_test.go

@@ -0,0 +1,23 @@
+package beads
+
+import "testing"
+
+func TestNeedsForceForID(t *testing.T) {
+	tests := []struct {
+		id   string
+		want bool
+	}{
+		{id: "", want: false},
+		{id: "hq-mayor", want: false},
+		{id: "gt-abc123", want: false},
+		{id: "hq-mayor-role", want: true},
+		{id: "st-stockdrop-polecat-nux", want: true},
+		{id: "hq-cv-abc", want: true},
+	}
+
+	for _, tc := range tests {
+		if got := NeedsForceForID(tc.id); got != tc.want {
+			t.Fatalf("NeedsForceForID(%q) = %v, want %v", tc.id, got, tc.want)
+		}
+	}
+}