Branching zones G8h: Abyss Portal three sequential forks

T5 zone, eighth authored graph. Shape: three fork nodes in series —
binary, binary, ternary capstone. Player makes three separate fork
decisions in this zone, more than any other shipping zone, matching
the "things keep getting worse" thematic descent.

First zone with LockStatCheck CON (mind_corridor, DC 16, psychic
pressure flavor) — completes the full ability roster (STR/DEX/CON/
INT/WIS/CHA) across shipping zones by G8h. reality_seam secret
LootBias 3.0, the highest authored.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/plugin/zone_graph_abyss_portal_test.go

@@ -0,0 +1,70 @@
+package plugin
+
+import "testing"
+
+func TestAbyssPortalGraph_Registered(t *testing.T) {
+	g, ok := zoneGraphRegistry[ZoneAbyssPortal]
+	if !ok {
+		t.Fatal("zoneAbyssPortalGraph not registered")
+	}
+	if len(g.Nodes) != 13 {
+		t.Errorf("nodes = %d, want 13", len(g.Nodes))
+	}
+}
+
+// TestAbyssPortalGraph_ThreeSequentialForks confirms the design shape:
+// three fork nodes in series, each binary or ternary.
+func TestAbyssPortalGraph_ThreeSequentialForks(t *testing.T) {
+	g := zoneAbyssPortalGraph()
+	wants := map[string]int{
+		"abyss_portal.fork1": 2,
+		"abyss_portal.fork2": 2,
+		"abyss_portal.fork3": 3,
+	}
+	for id, want := range wants {
+		if got := len(g.outgoingEdges(id)); got != want {
+			t.Errorf("%s outgoing = %d, want %d", id, got, want)
+		}
+	}
+}
+
+func TestAbyssPortalGraph_AllCapstoneLeavesReachBoss(t *testing.T) {
+	g := zoneAbyssPortalGraph()
+	for _, leaf := range []string{
+		"abyss_portal.direct_assault",
+		"abyss_portal.usurper_throne",
+		"abyss_portal.reality_seam",
+	} {
+		if !reachable(g, leaf, "abyss_portal.boss") {
+			t.Errorf("%s unreachable to boss", leaf)
+		}
+	}
+}
+
+// TestAbyssPortalGraph_FullStatRosterCoverage confirms the
+// project-wide claim: by G8h, all six abilities (STR/DEX/CON/INT/WIS/
+// CHA) appear as authored stat-check locks across shipping zones.
+// CON is the missing one prior to this zone — locked here on
+// mind_corridor.
+func TestAbyssPortalGraph_FullStatRosterCoverage(t *testing.T) {
+	g := zoneAbyssPortalGraph()
+	conSeen := false
+	for _, outs := range g.Edges {
+		for _, e := range outs {
+			if e.Lock == LockStatCheck && lockDataString(e.LockData, "stat") == "CON" {
+				conSeen = true
+			}
+		}
+	}
+	if !conSeen {
+		t.Error("expected at least one CON stat-check edge — completes ability roster by G8h")
+	}
+}
+
+func TestAbyssPortalGraph_RealitySeamHighestBias(t *testing.T) {
+	g := zoneAbyssPortalGraph()
+	seam := g.Nodes["abyss_portal.reality_seam"]
+	if seam.Content.LootBias < 3.0 {
+		t.Errorf("reality_seam LootBias = %v, want >= 3.0 (Abyss capstone)", seam.Content.LootBias)
+	}
+}