Adv 2.0 D&D Phase R R1: Legacy activity-loop deprecation

Retires the standalone !adventure dungeon/mine/forage/fish daily loop in
favor of !expedition. Gate intercepts legacy 1/2/3/4 + word-form input
and DMs a deprecation notice; town services (shop/blacksmith/rest/thom)
stay on !adventure.

- Delete dead resolveActivity (269 lines) + parseActivityLocation; add
  isLegacyActivityInput + renderLegacyActivityDeprecation.
- Morning-DM menu rewritten to point at !expedition and the !forage etc.
  harvest commands; writeAdvLocationLines removed (sole caller).
- New dnd_r1_migration.go runs archiveOrphanZoneRuns at Init: archives
  any active dnd_zone_run not linked to an active expedition (via
  exp.run_id or region_state.region_runs). Idempotent.
- Pre-existing flake in TestPickEveningRecap_BossOverridesAll fixed
  (E6c pool added entries without literal "boss"; widen substring set).
- Internal helpers (resolveAdvAction, advEligibleLocations, AdvLocation
  tier data, consumable drops) preserved — babysit/scheduler still use
  them passively.

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

internal/plugin/dnd_expedition_cycle_test.go

@@ -199,7 +199,18 @@ func TestPickEveningRecap_BossOverridesAll(t *testing.T) {
 	if got == "" {
 		t.Fatal("expected boss-killed flavor")
 	}
-	if !strings.Contains(strings.ToLower(got), "boss") {
+	// Boss-killed pool entries reference the kill in varied ways — "boss",
+	// "thing in the chamber", "vacancy", etc. Match any of the recurring
+	// motifs rather than the literal word.
+	low := strings.ToLower(got)
+	matched := false
+	for _, marker := range []string{"boss", "thing in the chamber", "vacancy"} {
+		if strings.Contains(low, marker) {
+			matched = true
+			break
+		}
+	}
+	if !matched {
 		t.Errorf("expected boss-killed pool, got %q", got)
 	}
 }