feat: Rust combat engine (38k LOC, 1599 tests, full modifier pipelines)

docs/research/codex-adversarial-2026-04-01.md

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+# Codex Adversarial Review — 2026-04-01 (post-parity suite)
+
+## State: 1686 passed, 0 failed, 1 ignored
+
+## Findings (10 total: 2 critical, 6 high, 2 medium)
+
+### Critical
+1. **Power cards are inert after play** — install_power is a short allowlist. Barricade, Demon Form, Noxious Fumes, A Thousand Cuts, Infinite Blades, Well-Laid Plans, Corruption all no-ops.
+2. **Double Tap, Burst, Echo Form not wired** — Java replays cards, Rust ignores them.
+
+### High  
+3. **After Image ordering** — Rust fires before card effects; Java queues it after card's own actions in the action queue (subtle ordering difference).
+4. **Delayed-turn tags dead** — next_turn_block, next_turn_energy, draw_next_turn, retain_hand, no_draw never consumed at turn start/end.
+5. **Enemy move effects dropped** — narrow whitelist, many effects (Hex, Wounds, Constricted, debuff removal, Heart buffs, upgraded Burns, draw reduction) never consumed. Key mismatch: burn_upgrade vs burn+.
+6. **Relic triggers write unused flags** — Bag of Preparation, Ring of the Snake, Pocketwatch, Damaru, Ink Bottle, Mummified Hand effects never consumed.
+7. **Orange Pellets hardcoded debuff subset** — should clear ALL debuffs, not just 5.
+8. **Run simulation far from Java** — no Neow, Watcher-only, ends after first boss, placeholder rewards.
+
+### Medium
+9. **Status key mismatches** — NoDraw vs "No Draw", LikeWater vs LikeWaterPower, Omega vs OmegaPower.
+10. **TODO cards still approximations** — Conjure Blade, Omniscience, Wish.

docs/research/codex-post-phase1-2026-04-01.md

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+# Codex Post-Phase-1 Review (2026-04-01)
+
+## Core Issue
+Phase 1 installed 68 handlers but many write statuses the engine never reads.
+"Many new installs now write statuses that the live engine never reads."
+
+## 15 Findings (12 high, 3 medium)
+
+### Status keys wrong (fix immediately)
+- "Tools of the Trade" → Java "Tools Of The Trade"
+- "Well-Laid Plans" → Java "Retain Cards"  
+- "Hello World" → Java "Hello"
+- "Electrodynamics" → Java "Electro"
+- "Sadistic Nature" → Java "Sadistic"
+
+### Statuses installed but never consumed by engine
+- Corruption: skills should cost 0 + exhaust (engine.rs effective_cost + play_card)
+- Establishment: retained cards cost -1 (engine.rs effective_cost)
+- Machine Learning: extra draw per turn (engine.rs start_player_turn)
+- Bullet Time: hand costs 0 + No Draw (engine.rs effective_cost + draw_cards)
+- Doppelganger: next turn draw+energy (engine.rs start_player_turn)
+- Wraith Form: -1 Dex per turn (engine.rs start_player_turn)
+- Echo Form: replay first card (engine.rs play_card)
+- Creative AI: add random Power to hand (engine.rs start_player_turn)
+
+### Temporary effects never expire
+- Rage: should clear at end of turn
+- Flex (TempStrength): should remove at end of turn
+- Piercing Wail (TempStrengthLoss): should restore at end of turn
+
+### Card behavior bugs
+- Ragnarok: incorrectly enters Wrath stance (Java doesn't)
+- damage_random_x_times: hits all enemies once THEN random loop (should be random only)
+- Conjure Blade: Expunger never reads ExpungerHits
+- Electrodynamics: wrong amount, should channel Lightning + set Electro
+- Heart painful_stabs: should be ongoing power, not immediate Wound
+
+### Still approximations (medium)
+- Meditate, Lesson Learned, Foreign Influence, Omniscience, Wish
+- PowerId registry has non-Java IDs
+- CardDef missing Java tag field (HEALING, STRIKE, etc.)

docs/research/codex-post-phase15-2026-04-01.md

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+# Codex Post-Phase-1.5 Review (2026-04-01)
+
+## 5 Findings (3 high, 2 medium)
+
+### 1. HIGH: 11 powers still installed but never consumed
+- Establishment, RetainCards, Loop, Electrodynamics, Magnetism, Mayhem (from install_power)
+- DoppelgangerDraw, DoppelgangerEnergy, WraithForm, EchoForm, CreativeAI (from card_effects)
+- Helper consumers exist in powers/buffs.rs but engine.rs never calls them
+
+### 2. HIGH: Trigger ordering mismatches
+- Devotion fires pre-draw (should be post-draw)
+- Metallicize/PlatedArmor/LikeWater fire before status card damage (should be after in Java?)
+- WraithForm not consumed at all (should lose Dex each turn)
+
+### 3. MEDIUM: Raw status strings remain in peripheral files
+- state.rs, potions.rs, relics/run.rs, obs.rs, enemies/*.rs still use raw strings
+
+### 4. MEDIUM: 131 card effect tags still unhandled
+- High-signal: next_turn_energy/block/draw, double_tap, burst, echo_form, creative_ai
+- rampage, finisher, flechettes, genetic_algorithm, dual_wield, recycle, discovery, madness, etc.
+
+### 5. HIGH: Damage pipeline missing generic power hooks
+- deal_damage_to_enemy: misses Invincible cap, ModeShift, Angry, Curiosity, Buffer
+- deal_damage_to_player: misses Thorns, Flame Barrier, Static Discharge
+- Hardcoded double_damage=false, flight=false
+- Offering HP loss bypasses Rupture hook

docs/research/codex-post-phase2-2026-04-01.md

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+# Codex Post-Phase-2 Review (2026-04-01)
+
+## 5 HIGH findings
+
+### 1. Turn ordering mismatches
+- WraithForm: Rust start-turn, Java end-turn
+- Loop: Rust end-turn, Java start-turn
+- CreativeAI/Magnetism: Rust post-draw, Java start-turn
+
+### 2. 10 remaining dead statuses
+- Mayhem, RetainCards (installed but no-oped)
+- DrawCard, NextTurnBlock, Energized (set by card_effects, never consumed at turn start)
+- DoubleTap, Burst (set by card_effects, never consumed in play_card)
+- Curiosity, Invincible (helpers exist, never called)
+
+### 3. Double Tap/Burst/Echo Form replay incomplete
+- DoubleTap/Burst: statuses set but play_card never checks them
+- EchoForm: only re-runs effects, Java duplicates full card from onUseCard
+
+### 4. Enemy damage pipeline gaps
+- Invincible cap not checked in deal_damage_to_enemy
+- Flight per-turn reset missing
+- Angry too broad (fires on poison/thorns, Java only on player attacks)
+
+### 5. Reactive power cards never install
+- Static Discharge, Flame Barrier: card tags exist but install_power has no match arm
+- Curiosity: helper exists but never called from play_card