3 Opus 4.6 agents audited trigger system, enemy AI, and architecture.

Key findings:
- 7 missing trigger hook types (on_attacked, on_hp_loss, on_block_gained, etc.)
- Time Eater, Transient, Nemesis have broken enemy-specific mechanics
- No minion spawning (Collector, Automaton, Reptomancer, GremlinLeader)
- ~400 lines dead code (65 dead fns in buffs.rs alone)
- Death-check-fairy pattern duplicated 7 times
- Block gain scattered 27 places with no central hook
- Run is Act 1 only (no Neow, no act transitions)

Full details in docs/research/full-audit-2026-04-02.md

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Wire all relic/power modifiers into the 6 combat pipelines:

- Incoming damage: Paper Crane (Weak 0.60), Odd Mushroom (Vuln 1.25)
- Debuff application: Ginger blocks Weak, Turnip blocks Frail
- Healing: centralized heal_player() with Mark of Bloom (blocks) + Magic Flower (1.5x)
- Card cost: Snecko Eye + Snecko Oil set CONFUSION status
- Secondary damage: BowlingBash/Ragnarok use calculate_damage_full (pen nib, flight, etc.)
- Potion hooks: Toy Ornithopter heals on potion use

Cross-enemy effects via new mfx types (BLOCK_ALL_ALLIES, HEAL_LOWEST_ALLY,
STRENGTH_ALL_ALLIES) processed in execute_enemy_move:
- Centurion Protect gives block to allies
- Mystic heals lowest-HP ally
- GremlinLeader Encourage buffs minions

Fix unreachable enemy moves:
- AcidSlime M/L: add Lick to cycle
- WrithingMass: MegaDebuff fires once after first BigHit
- Repulsor: 5-turn cycle (Daze x4 -> Attack)

Cleanup: fix critical match-arm bug where ~70 passive relics set
HAS_MARK_OF_BLOOM, remove dead lookup_by_status, fix stale docstrings.

1599 tests pass.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Add complete player choice system for MCTS-compatible interactive
decisions: ChoiceReason/ChoiceOption/ChoiceContext types, begin_choice()
with safety guards, resolve_choice() dispatcher with 9 resolve methods
(Scry, DiscardFromHand, ExhaustFromHand, PutOnTopFromHand, PickFromDiscard,
PickFromDrawPile, DiscoverCard, PickOption, PlayCardFree).

Wire relic counter persistence via CombatState.relic_counters synced
to/from RunState.relic_flags at combat boundaries. Add RelicFlags
bitfield module with 31 boolean flags + 8 counter indices.

Add ~25 card effect handlers including Discovery, Foreign Influence,
Omniscience, Wish, Seek, Warcry, Headbutt, exhaust_choose, dual_wield,
flame_barrier, calculated_gamble, and more.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Add ChoiceReason::DualWield with resolve_dual_wield() that duplicates
  selected hand card (1 copy base, 2 upgraded via max_picks)
- Add ChoiceReason::UpgradeCard with resolve_upgrade_card() that sets
  UPGRADED flag on selected hand card
- Add ChoiceReason::PickFromExhaust + ChoiceOption::ExhaustCard with
  resolve_pick_from_exhaust() that moves card from exhaust to hand
- Fix: all three were using PickOption/PickFromDiscard which silently
  no-oped because resolve_pick_option only matches Named options

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Status consumption:
- POTION_DRAW: draw cards after potion use (Swift Potion etc.)
- CENTENNIAL_PUZZLE_DRAW: draw 3 after unblocked damage
- RUNIC_CUBE_DRAW: draw 1 after unblocked damage (persistent)
- GREMLIN_HORN_DRAW: draw 1 + gain 1 energy on enemy kill
- EMOTION_CHIP_TRIGGER: trigger front orb passive after HP loss

Sentry stagger: middle Sentry (index 1) starts on Beam instead
of Bolt, matching the real game's alternating pattern.

on_victory: call relics::on_victory() after combat win to apply
Burning Blood, Black Blood, Meat on the Bone healing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

on_draw (in draw_cards loop):
- lose_energy_on_draw: Void loses 1 energy when drawn
- copy_on_draw: Endless Agony adds copy to hand when drawn

on_discard (new on_card_discarded method):
- draw_on_discard: Reflex draws N cards when discarded
- energy_on_discard: Tactician gains N energy when discarded
- Tracks DISCARDED_THIS_TURN for Sneaky Strike/Eviscerate
- Wires Tough Bandages and Tingsha relic triggers
- Only fires on manual discard, NOT end-of-turn discard

on_retain (in end_turn retain processing):
- Establishment: reduce retained card cost
- reduce_cost_on_retain: Sands of Time cost reduction
- grow_block_on_retain: Perseverance scaling via status counter
- grow_damage_on_retain: Windmill Strike scaling via status counter

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Tag mismatch fixes:
- add_shivs: Blade Dance, Cloak and Dagger now fire shiv handler
- add_wound_to_draw: Wild Strike adds Wounds to draw pile (not discard)
- add_dazed_to_draw: Reckless Charge adds Dazed to draw pile
- enlightenment_this_turn / enlightenment_permanent: both variants
- apply_lock_on: Bullseye applies Lock-On status

New simple effect handlers (25):
- HP: lose_hp, lose_hp_gain_energy, lose_hp_gain_str
- Draw: draw_to_n, draw_if_no_attacks, draw_if_few_cards_played
- Block: block_from_discard, block_if_no_block
- Conditionals: if_vulnerable_energy_draw, if_weak_energy_draw,
  weak_if_attacking, reduce_str_this_turn
- Pile: discard_random, shuffle_discard_into_draw, remove_enemy_block
- Energy: energy_per_cards_in_draw
- Status: no_draw, retain_block (Blur), the_bomb
- Card gen: add_wounds_to_hand, poison_random_multi

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Add status-counter-based scaling for Rampage (+5/play), Glass Knife
(-2/play), Genetic Algorithm (+2 block/play), Ritual Dagger (+3 on
kill), and Streamline (reduce cost in piles). Add MCTS-compatible
card generation for Infernal Blade, Distraction, Jack of All Trades,
Violence, Metamorphosis, Chrysalis, and Transmutation using
deterministic representative cards. 6 new tests, 1612 total passing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…nce overrides

Add 9 choice-based card handlers: Secret Weapon/Technique (search draw
pile by type), Hologram (return from discard to hand), Forethought
(hand to bottom at cost 0), Recycle (exhaust for energy), Concentrate
(discard N gain energy), Purity (exhaust from hand), Setup (hand to
top at cost 0), Thinking Ahead (draw 2 then put 1 on top).

Fix effective_cost_inst/effective_cost_mut_inst to use CardInstance.cost
when >= 0, falling back to CardDef.cost only when instance cost is -1
(the default). This ensures runtime cost modifications (Streamline,
Madness, Setup, etc.) are properly respected for both playability
checks and energy deduction. Also adds FLAG_FREE check.

7 new tests (1613 total passing).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

# Conflicts:
#	packages/engine-rs/src/card_effects.rs
#	packages/engine-rs/src/tests/test_integration.rs

Fix OrbSlots.orbs -> .slots, construct PassiveEffect from orb type
for Emotion Chip trigger, add missing relics import in run.rs.

1619 tests passing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Power installs: Phantasmal Killer (double damage), Biased Cognition
(focus + decay), Amplify, Self Repair (end-of-combat heal), Corpse
Explosion (AoE on enemy death), Equilibrium (retain hand), Sentinel
(energy on exhaust under Corruption), Escape Plan (conditional block).

Dynamic cost: Blood for Blood (-1 per HP lost), Force Field (-1 per
active power), Eviscerate (-1 per discard this turn). All wired in
both effective_cost_inst and effective_cost_mut_inst.

Innate: scan draw pile after shuffle in start_combat, move cards with
"innate" tag to top so they appear in opening hand.

Misc: Sneaky Strike energy refund, HP_LOSS_THIS_COMBAT tracking,
count_active_powers helper, block_if_skill skip in standard block
path. 7 new tests (1626 total passing).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…multi-hit

Critical fixes:
- Draw pile top inverted in 4 resolvers (Scry, Warcry, Headbutt, Setup)
  used insert(0) instead of push() — put cards on bottom not top
- Sharp Hide now uses player_lose_hp() instead of direct hp -=
- Double Establishment cost reduction removed from effective_cost
- Vigor/Pen Nib only applied on first hit of Bowling Bash and Ragnarok
- Gambling Chip restricted to turn 1 only
- Runic Cube draw status zeroed after consuming
- Beat of Death checks player death between enemy iterations

High fixes:
- Bouncing Flask+ unified with base handler (base_magic=4 for 4 bounces)
- Storm of Steel+ uses same handler, generates Shiv+ via card name check
- Necronomicon checks effective cost instead of CardDef base cost
- Meditate uses begin_choice for proper card selection from discard
- Wish Gold option is now a no-op (can't modify run gold in combat)
- Forethought correctly uses insert(0) for bottom of draw pile

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…nctions

Step 0 of modular card effect migration. Adds src/effects/ with:
- EffectFlags: 256-bit bitset for O(1) tag checking (replaces O(n) string scan)
- CardEffectEntry: static fn pointer table per effect tag (mirrors powers/registry.rs)
- 8 dispatch functions: can_play, modify_cost, modify_damage, on_play, on_retain,
  on_draw, on_discard, post_play_dest
- Precomputed hook masks via OnceLock for fast early-out
- CardRegistry.effect_flags_vec computed at init time

Registry is empty — no behavior change. All 1629 tests pass.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…Stab cost

Bug 1: Omniscience now picks from draw pile (PlayCardFreeFromDraw)
instead of incorrectly picking from hand.

Bug 2: Perseverance grow_block_on_retain and Windmill Strike
grow_damage_on_retain bonuses are now read back in damage/block
calculations, not just written during end_turn retain hooks.

Bug 3: Masterful Stab cost_increase_on_hp_loss handler added to
both effective_cost_inst and effective_cost_mut_inst, increasing
cost by total_damage_taken (opposite of Blood for Blood).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Replaces O(n) string `contains()` checks with O(1) bitset operations:
- can_play: unplayable, only_attack_in_hand, only_attacks_in_hand, only_empty_draw
- modify_cost: cost_reduce_on_hp_loss, reduce_cost_per_power, cost_reduce_on_discard, cost_increase_on_hp_loss
- on_retain: reduce_cost_on_retain, grow_block_on_retain, grow_damage_on_retain
- on_draw: lose_energy_on_draw, copy_on_draw
- on_discard: draw_on_discard, energy_on_discard
- post_play_dest: shuffle_self_into_draw, end_turn

Unifies duplicate cost modification code in effective_cost_inst/effective_cost_mut_inst.
All 1629 tests pass with no behavior change.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Replaces damage preamble string checks with dispatch_modify_damage:
- heavy_blade, damage_equals_block, damage_plus_mantra, perfected_strike
- rampage, glass_knife, ritual_dagger, searing_blow
- grow_damage_on_retain (Windmill Strike, dual on_retain + modify_damage)
- damage_random_x_times (skip generic damage flag)

DamageModifier struct merges base_damage_override, base_damage_bonus,
strength_multiplier, and skip_generic_damage across all active hooks.
Perseverance block bonus migrated to EffectFlags bit check.

All 1629 tests pass with no behavior change.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>