Long expeditions D1-e: T5 zones to new 36-44 room band

Closes D1. Both T5 zones follow the D1-a/b/c/d pattern: extend the
graph so the longest entry→boss walk lands in band, keep the zone's
authored topology intact. Also backfills the missing per-node
RegionID authoring against dnd_expedition_region.go — the D1-d
deferral note flagged this as a prerequisite for T5.

  dragons_lair (T5): 12 → 47 nodes, longest 38 (band 36-44)
  abyss_portal (T5): 13 → 51 nodes, longest 39 (band 36-44)

Topology preserved per zone:
- Dragon's Lair: 4-region authoring (every node carries a valid
  RegionID); binary-converging fork1 (ash_bridge TRAP / treasure_vault
  Perception 15) still converges at the R3 wyrmlings_nest elite;
  capstone fork2 still 3-way (LockNone / CHA 16 / Perception 17
  SECRET LootBias 2.5) with each spur preserving its own named
  capstone node. New R4 infernax_doors MERGE consolidates the long
  final hall instead of triplicating it.
- Abyss Portal: 4-region authoring; three sequential forks preserved
  (binary / binary / ternary) — fork1 Perception 16, fork2 CON 16
  (full STR/DEX/CON/INT/WIS/CHA roster still covered), fork3 capstone
  3-way with reality_seam SECRET LootBias 3.0. New R4 belaxath_doors
  MERGE consolidates the final tear-approach.

MinRooms/MaxRooms re-pitched 9-10 → 36-44 so the dice fallback also
lands in band for any future graphless variant.

internal/plugin/dnd_zone.go

@@ -663,8 +663,8 @@ func zoneDragonsLair() ZoneDefinition {
 		Faction:    "Kobolds, Drakes, Young Dragons, Wyrm",
 		Atmosphere: "Scorched stone, rivers of gold coins half-melted into the floor, kobold warrens as outer defenses, growing heat, the unmistakable smell of something ancient and enormous.",
 		Hook:       "The mountain has not erupted in forty years. The locals say it is dormant. The locals are wrong about what lives in mountains. I have prepared an unusually long entry description for this one.",
-		MinRooms:   9,
-		MaxRooms:   10,
+		MinRooms:   36,
+		MaxRooms:   44,
 		Enemies: []ZoneEnemy{
 			{BestiaryID: "kobold", SpawnWeight: 7},
 			{BestiaryID: "guard_drake", SpawnWeight: 5},
@@ -711,8 +711,8 @@ func zoneAbyssPortal() ZoneDefinition {
 		Faction:    "Demons, Fiends, Corrupted Celestials",
 		Atmosphere: "Reality fractures, impossible geometry, constant low psychic pressure, the feeling of being watched by something that has no eyes.",
 		Hook:       "Someone opened a door they should not have opened. The door is still open. Things are still coming through. I am not making jokes about this one.",
-		MinRooms:   9,
-		MaxRooms:   10,
+		MinRooms:   36,
+		MaxRooms:   44,
 		Enemies: []ZoneEnemy{
 			// Phase 4-B (outlier fix): Nalfeshnee was mis-classified
 			// as a standard at T5 — Phase 4-A measured 2.8% win rate