Companion: he carries his wounds, rations his slots, and heals himself

Three defects, all the same mistake, all found by sweep and not by tests: the
companion has no database row for a thing to persist onto, so the thing "arrives
fresh next time" — which for a resource means infinite.

1. His spell slots refilled every fight. The ledger went on his combat SEAT, and
   a seat is per-session. A human rations one pool across a 30-room run and gets
   it back at camp; rationing it IS the caster's game. Now on
   expedition_party.companion_slots_used, refreshed at camp. (Worth ~0pp alone —
   a run holds only ~2 real fights, so the pool never binds. I predicted this was
   the whole answer. It was not.)

2. His BODY refilled every fight. buildFightSeats seated him at Stats.MaxHP and
   the close-out skipped him — "he arrives fresh next time", said the comment.
   That is an infinite body: he soaked a share of every fight's incoming and then
   reset, while the humans beside him bled all the way to camp. THIS was the
   carry. Now expedition_party.companion_hp; healed at camp; a dropped companion
   returns on 1 HP rather than as a corpse, because there is no companion-death
   rule and inventing one inside a bug fix would be a second feature.

3. No autopiloted caster had ever healed ITSELF. simPickAllyHeal skipped
   `i == seat` and bailed on !IsParty(), so a solo cleric carried cure_wounds for
   a whole run and never once cast it. Now simPickHeal: heal whoever is worst off,
   which is sometimes you.

Measured, 640 runs/arm, like-for-like (the leaders whose role-fill gives Pete a
Cleric, against a human Cleric follower of the leader's own level):

  solo                    69.0%
  + a human cleric        77.6%   (+8.6pp)
  + Pete                  66.1%   (-2.9pp)

The reference arm is the point. Against SOLO even a mace-only Pete looked like a
carry — but parties are designed to be safer, so solo is the wrong yardstick.
Against a human peer the real bug appeared: a gearless, level-penalized hireling
was out-clearing a fully-geared human cleric of the leader's own level by 15pp,
because he was the only combatant in the game who healed to full between fights.

With the free lunches gone he is honest, and honestly a net negative — which is
exactly the plan's §2 diagnosis, unmasked: a below-median seat cannot pay for its
own enemy scaling (+15% boss HP and 2.4 enemy actions a round instead of 1).
§2(a) is next, and the sweep now argues FOR it; before this commit it would have
made things worse.

Self-heal moved solo 66.1% -> 66.2%, so the balance corpus is undisturbed and no
re-baseline is owed. It is also NOT the answer to §6 — casters reach for a healing
consumable first and the sim stocks them, so a human rarely falls through to the
spell. Pete carries no consumables, so it is his only heal.

Claude-Session: https://claude.ai/code/session_01J5SQZWoLmL3M3mw2XmHHdy

internal/plugin/zone_combat_party.go

@@ -79,8 +79,14 @@ func (p *AdventurePlugin) runZoneCombatRoster(
 		// than loaded, and his seatBuild is flagged so the close-out loop below
 		// gives him no XP, no loot, and no post-combat persistence.
 		if isCompanionSeat(uid) {
-			class, level := companionLoadout(companionExpeditionFor(roster[0]))
+			expID := companionExpeditionFor(roster[0])
+			class, level := companionLoadout(expID)
 			player, e, _ := p.companionCombatant(class, level, monster, tier, dmMood)
+			// The wounds he carries into this fight. His synthetic sheet is always
+			// written at full HP, so applyDnDHPScaling left StartHP at the
+			// "enter at MaxHP" sentinel and he healed himself for free between every
+			// room of the run. See companionSeatHP.
+			player.Stats.StartHP = companionSeatHP(expID, player.Stats.MaxHP)
 			if leader {
 				enemy = e
 			}
@@ -162,7 +168,12 @@ func (p *AdventurePlugin) runZoneCombatRoster(
 		// deduct from, no sheet to persist to, no XP to earn. Every call below
 		// would either write rows for a bot or log an error about the rows it
 		// hasn't got.
+		//
+		// His HP is the exception, and it is not bookkeeping — it is the fight's
+		// result. Without it he re-enters the next room at full while the humans
+		// beside him carry every wound to camp.
 		if b.companion {
+			_ = setCompanionHP(companionExpeditionFor(roster[0]), seatRes.PlayerEndHP)
 			continue
 		}