Phase 3b (sweep): nick-floor + supply-burn sweep, T5 supply unlock

Wired SurpriseNickFloorOverride and SupplyBurnRatePctOverride into the
harness day-loop via two new parameterized helpers (surpriseRoundNickF,
applyDailyBurnP). Live callers go through the existing constants;
sweep test sits on top of the Phase 3-A best cell (e=23, d=1).

TestExpeditionBalance_Phase3B_NickSupplySweep walks 3×3 (floor ∈ {0, 1,
tier=live}) × (burn% ∈ {50, 75, 100=live}) × 10 zones × 200 trials.

Strong partial T5 positive; nick-floor lever inert.

  - Supply burn is the T5 unlock: dragons_lair 0% → ~55% at burn=50.
    Fighter survives elites; burn=75 isn't enough margin.
  - T4 peaks at burn=75 (~12% underdark/feywild); burn=50 dips T4
    slightly (more elites survived into).
  - Nick-floor inert across tiers (≤3pp swing); wounded-clamp already
    eats the chip-damage budget. Recommend dropping from live-tuning
    candidates.
  - T2-T3 wall persists: forest_shadows, manor_blackspire,
    abyss_portal stuck at ~0% across every combo — outliers, not
    addressable by global levers.

Global levers wrung out. Plan-doc Phase 3-B section + memory pointers
updated; next is Phase 4 (per-zone outlier pass). -short shows the
same two pre-existing failures (TestAdv2Scenario_ZoneRunGoblinWarrens,
TestMageSpellbookLineInRender).

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

internal/plugin/dnd_expedition_supplies.go

@@ -164,6 +164,15 @@ func makeSupplies(tier ZoneTier, p SupplyPurchase) ExpeditionSupplies {
 //     where HarshMod is 1×) — the dungeon is actively starving you out.
 //   - otherwise, harshActive applies HarshMod (zone-tier scaled).
 func applyDailyBurn(s ExpeditionSupplies, harshActive, siege bool) (ExpeditionSupplies, float32) {
+	return applyDailyBurnP(s, harshActive, siege, 0)
+}
+
+// applyDailyBurnP is the rate-parameterized form used by the Phase 3-B
+// sim harness lever sweep. burnRatePct == 0 means "use live" (100%);
+// any positive value scales the final per-day burn by that percent
+// (e.g. 50 = half burn). Live callers always go through applyDailyBurn.
+// See gogobee_expedition_difficulty.md Phase 3-B.
+func applyDailyBurnP(s ExpeditionSupplies, harshActive, siege bool, burnRatePct int) (ExpeditionSupplies, float32) {
 	burn := s.DailyBurn
 	switch {
 	case siege:
@@ -179,6 +188,9 @@ func applyDailyBurn(s ExpeditionSupplies, harshActive, siege bool) (ExpeditionSu
 		}
 		burn *= mult
 	}
+	if burnRatePct > 0 {
+		burn = burn * float32(burnRatePct) / 100
+	}
 	s.Current -= burn
 	if s.Current < 0 {
 		s.Current = 0