J3 D8-d-fix: caster AC floor + HP ×1.25

computeAC: lift caster floors (cleric/druid 3→5, bard/warlock 1→3,
mage/sorcerer 0→2). Ranger 3 / rogue 1 / fighter+paladin 6 unchanged.

computeMaxHP: new casterHPMult(class) = 1.25 for the same caster set,
applied multiplicatively on top of phase5BHPMult. Martials unchanged.
New caster L10 HPMax: mage/sorc ~98 (was 78), bard/cleric/druid/warlock
~118 (was 95); martial L10 ~141 unchanged.

bootstrap_caster_hp.go: new bootstrapCasterHPRefresh (job key
caster_hp_refresh_v1) refreshes existing rows once at startup; mirrors
bootstrapPhase5BHPRefresh — only raises HPMax, preserves absolute
wound. Wired in adventure.go.

Measured on n=2500 d8dfix2 corpus (gitignored sim_results) vs d8c:
- T3 manor caster lift confirmed — bard +13 (43→56), druid +8 (88→96),
  warlock +8, sorcerer +5, mage +5, cleric +2. Martials flat.
- Macro deltas: bard +2.6, warlock +2.0, druid +1.4, mage/sorcerer +1.0,
  cleric -0.2. n=500 1σ ≈ 2.2pp — bard/warlock cleanly past noise.
- T4 underdark wall still holds (every caster ~0%). Lift directionally
  correct but undersized for T4 atk-bonus + multiattack — separate
  follow-up.
- T5 dragons_lair universal wall unchanged (martials TPK too).

Diagnostic context: project_d8d_diagnostic. Cleric flat manor likely
the concentration AOE re-tick engine gap (filed for D8-e+).

internal/plugin/dnd_test.go

@@ -70,10 +70,10 @@ func TestComputeMaxHP_MageLevel5(t *testing.T) {
 	// Mage d6, CON +1
 	// L1: 6 + 1 = 7
 	// L2-5: 4 levels × (avg 4 + 1) = 4 × 5 = 20
-	// Raw total: 27; Phase 5-B: 27 × 1.5 = 40.5 → 41 (round half-up).
+	// Raw total: 27; Phase 5-B × casterHPMult: 27 × 1.5 × 1.25 = 50.625 → 51.
 	got := computeMaxHP(ClassMage, 1, 5)
-	if got != 41 {
-		t.Errorf("Mage L5 (CON+1) = %d, want 41 (27 raw × phase5BHPMult)", got)
+	if got != 51 {
+		t.Errorf("Mage L5 (CON+1) = %d, want 51 (27 raw × phase5BHPMult × casterHPMult)", got)
 	}
 }
 
@@ -94,8 +94,12 @@ func TestComputeAC(t *testing.T) {
 		{ClassFighter, 0, 16},  // 10 + 0 + 6
 		{ClassFighter, 2, 18},  // 10 + 2 + 6
 		{ClassRogue, 3, 14},    // 10 + 3 + 1
-		{ClassMage, 0, 10},     // 10 + 0 + 0
-		{ClassCleric, 1, 14},   // 10 + 1 + 3
+		{ClassMage, 0, 12},     // 10 + 0 + 2 (D8-d-fix caster floor)
+		{ClassSorcerer, 1, 13}, // 10 + 1 + 2
+		{ClassCleric, 1, 16},   // 10 + 1 + 5 (D8-d-fix caster floor)
+		{ClassDruid, 0, 15},    // 10 + 0 + 5
+		{ClassBard, 2, 15},     // 10 + 2 + 3 (D8-d-fix caster floor)
+		{ClassWarlock, 0, 13},  // 10 + 0 + 3
 		{ClassRanger, 2, 15},   // 10 + 2 + 3
 	}
 	for _, c := range cases {