Adv 2.0 D&D Phase 12 E6a: Multi-region expedition map (!map)

Adds renderRegionChain — for tier 4-5 multi-region zones, renders the
4-region progression (e.g. ST──DO──IW──TDT for Underdark) with ✓
cleared / ▶ here / · pending markers, and ⛺ overlay where a base
camp has been pitched. Single-region zones skip the chain and fall
through to the existing renderZoneMap room layout.

!map (top-level) and !expedition map both invoke handleExpeditionMapCmd
which composes: region chain → current region label → per-run room
map → legend. Region abbreviations are decoded in a "Regions:" footer
so the glyph row stays compact.

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

internal/plugin/dnd_expedition_map_test.go

@@ -0,0 +1,80 @@
+package plugin
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestRenderRegionChain_SingleRegionZone(t *testing.T) {
+	e := &Expedition{ZoneID: ZoneSunkenTemple}
+	if got := renderRegionChain(e); got != "" {
+		t.Errorf("expected empty chain for single-region zone, got %q", got)
+	}
+}
+
+func TestRenderRegionChain_MultiRegionMarkers(t *testing.T) {
+	e := &Expedition{
+		ZoneID:        ZoneUnderdark,
+		CurrentRegion: "underdark_drow_outpost",
+		RegionState: map[string]any{
+			regionStateClearedKey:  []string{"underdark_surface_tunnels"},
+			regionStateBaseCampKey: []string{"underdark_drow_outpost"},
+		},
+	}
+	out := renderRegionChain(e)
+	if out == "" {
+		t.Fatalf("expected non-empty chain for multi-region zone")
+	}
+	lines := strings.Split(out, "\n")
+	if len(lines) != 2 {
+		t.Fatalf("expected 2 lines, got %d (%q)", len(lines), out)
+	}
+	bot := lines[1]
+	// 4 regions: cleared / camp(at-current) / pending / pending
+	// Camp marker overrides the ▶ (here) per renderRegionChain.
+	if !strings.Contains(bot, "✓") {
+		t.Errorf("expected ✓ for cleared region: %q", bot)
+	}
+	if !strings.Contains(bot, "⛺") {
+		t.Errorf("expected ⛺ at base-camp region: %q", bot)
+	}
+	if !strings.Contains(bot, "·") {
+		t.Errorf("expected · for pending region: %q", bot)
+	}
+}
+
+func TestRenderRegionChain_CurrentMarker(t *testing.T) {
+	e := &Expedition{
+		ZoneID:        ZoneUnderdark,
+		CurrentRegion: "underdark_drow_outpost",
+	}
+	out := renderRegionChain(e)
+	if !strings.Contains(out, "▶") {
+		t.Errorf("expected ▶ at current region (no camps yet): %q", out)
+	}
+}
+
+func TestRegionGlyph(t *testing.T) {
+	cases := map[string]string{
+		"Surface Tunnels":  "ST",
+		"The Deep Throne":  "TDT",
+		"Drow Outpost":     "DO",
+		"Illithid Warren":  "IW",
+		"Kobold Warrens":   "KW",
+	}
+	for name, want := range cases {
+		if got := regionGlyph(name); got != want {
+			t.Errorf("regionGlyph(%q) = %q, want %q", name, got, want)
+		}
+	}
+}
+
+func TestRenderRegionLegend_HasAllRegions(t *testing.T) {
+	e := &Expedition{ZoneID: ZoneUnderdark}
+	got := renderRegionLegend(e)
+	for _, want := range []string{"Surface Tunnels", "Drow Outpost", "Illithid Warren", "The Deep Throne"} {
+		if !strings.Contains(got, want) {
+			t.Errorf("legend missing %q: %s", want, got)
+		}
+	}
+}