Adv 2.0 D&D Phase R R3-R5: Combat-link, zone loot, fishing, economy

R3 — Combat Event Integration:
- dnd_expedition_combat.go: Combat Interrupt rolls (§4.2) with
  threat-clock and Ranger-wilderness modifiers; Patrol Encounters
  scaled by threat level; recordZoneKill writer with monsterKillTags.
- Interrupt gate at head of handleHarvestCmd; patrol gate before
  resolveRoom in zoneCmdAdvance; kill writer wired into combat-win
  paths.

R4a — Zone Loot Tables:
- dnd_zone_loot.go: §5 loot drop tables for all 10 zones × 5 tiers
  with §8.1 sell-value bands. dropTierFromCR brackets + boss floor.
- Hooks on combat-win in resolveCombatRoom, resolveBossRoom,
  runHarvestInterrupt, tryPatrolEncounter.

R4b — Fishing Integration:
- dnd_zone_fish.go: fishingZones allow-list, fishingSkillBonus,
  rangerRareCatchUpgrade (§6.2), feywildFishDistortion narration.
- §6.1 fish entries added to resource registry for Forest, Sunken
  Temple, Underdark, Feywild zones.
- !fish wired through handleHarvestCmd; zoneItemFlavor matrix
  populated for all 10 zones × all loot items.

R5 — Economy Integration:
- dnd_economy.go: !sell (post-expedition gate, single CHA Persuasion
  DC 17 → +15% bump), !craft (§8.2 4 exemplar recipes), !lore
  (INT/Arcana DC 15 recipe discovery).
- dnd_known_recipe table for persistent recipe discovery.

Flavor reuse: HarvestInterrupt, PatrolEncounter, CombatVictory,
PlayerDeath, LootDrop*, FeywildTimeDistortion* — all existing pools.
No new flavor file.

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

internal/db/db.go

@@ -1684,6 +1684,16 @@ CREATE TABLE IF NOT EXISTS dnd_expedition_log (
 );
 CREATE INDEX IF NOT EXISTS idx_expedition_log_recent
     ON dnd_expedition_log(expedition_id, timestamp DESC);
+
+-- One row per (user_id, recipe_id) once the player has discovered a Thom
+-- Krooke crafting recipe via !lore (Phase R5). Recipes are otherwise hidden
+-- from !craft list output until discovered.
+CREATE TABLE IF NOT EXISTS dnd_known_recipe (
+    user_id       TEXT NOT NULL,
+    recipe_id     TEXT NOT NULL,
+    discovered_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (user_id, recipe_id)
+);
 `
 
 // SeedSchedulerDefaults inserts default scheduler jobs if they don't exist.