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/bootstrap_caster_hp.go

@@ -0,0 +1,84 @@
+package plugin
+
+import (
+	"log/slog"
+
+	"gogobee/internal/db"
+)
+
+// bootstrapCasterHPRefresh recomputes hp_max for caster characters after
+// the J3 D8-d-fix caster HP multiplier (casterHPMult in dnd.go) shipped.
+// Without this, existing caster rows keep their pre-lift hp_max until
+// the next computeMaxHP recall (level-up / reset). Mirrors
+// bootstrapPhase5BHPRefresh — only ever raises hp_max, preserves the
+// absolute wound (delta added to hp_current, capped at new max). Run
+// once per startup, idempotent via db.JobCompleted.
+func bootstrapCasterHPRefresh() {
+	const jobName = "caster_hp_refresh_v1"
+	if db.JobCompleted(jobName, "once") {
+		return
+	}
+
+	d := db.Get()
+	rows, err := d.Query(`
+		SELECT user_id, class, con_score, dnd_level, hp_max, hp_current
+		FROM dnd_character WHERE dnd_level > 0`)
+	if err != nil {
+		slog.Error("caster hp refresh: enumerate failed", "err", err)
+		return
+	}
+	defer rows.Close()
+
+	type row struct {
+		userID    string
+		class     DnDClass
+		conScore  int
+		level     int
+		hpMax     int
+		hpCurrent int
+	}
+	var batch []row
+	for rows.Next() {
+		var r row
+		var classStr string
+		if err := rows.Scan(&r.userID, &classStr, &r.conScore, &r.level, &r.hpMax, &r.hpCurrent); err != nil {
+			slog.Warn("caster hp refresh: scan failed", "err", err)
+			continue
+		}
+		r.class = DnDClass(classStr)
+		batch = append(batch, r)
+	}
+
+	refreshed := 0
+	for _, r := range batch {
+		if casterHPMult(r.class) == 1.0 {
+			continue
+		}
+		conMod := abilityModifier(r.conScore)
+		newMax := computeMaxHP(r.class, conMod, r.level)
+		if newMax <= r.hpMax {
+			continue
+		}
+		delta := newMax - r.hpMax
+		newCurrent := r.hpCurrent + delta
+		if newCurrent > newMax {
+			newCurrent = newMax
+		}
+		if newCurrent < 1 {
+			newCurrent = 1
+		}
+		if _, err := d.Exec(`UPDATE dnd_character
+			SET hp_max = ?, hp_current = ?, updated_at = CURRENT_TIMESTAMP
+			WHERE user_id = ?`,
+			newMax, newCurrent, r.userID); err != nil {
+			slog.Warn("caster hp refresh: update failed", "user", r.userID, "err", err)
+			continue
+		}
+		refreshed++
+	}
+
+	db.MarkJobCompleted(jobName, "once")
+	if refreshed > 0 {
+		slog.Info("caster hp refresh: refreshed caster HPMax to D8-d-fix floor", "count", refreshed)
+	}
+}