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/plugin/dnd_zone_fish.go

@@ -0,0 +1,76 @@
+package plugin
+
+import (
+	"math/rand/v2"
+
+	"gogobee/internal/flavor"
+)
+
+// Resource & Combat Integration §6 — Fishing System Integration.
+//
+// Fishing reuses the harvest pipeline (HarvestFish action). This file
+// adds the §6 zone gate, the existing FishingSkill rank bonus, the
+// Ranger +20% rare-catch rule, and the Feywild Time Distortion hook.
+
+// fishingZones is the §6.1 allow-list — only these zones expose !fish.
+var fishingZones = map[ZoneID]bool{
+	ZoneForestShadows:   true,
+	ZoneSunkenTemple:    true,
+	ZoneUnderdark:       true,
+	ZoneFeywildCrossing: true,
+}
+
+// isFishingZone returns true if !fish is permitted in zoneID.
+func isFishingZone(zoneID ZoneID) bool { return fishingZones[zoneID] }
+
+// fishingSkillBonus folds the legacy FishingSkill (0–10) into a small
+// roll bonus so existing rank progression still pays off inside the
+// expedition pipeline. +1 per 5 levels, capped at +2.
+func fishingSkillBonus(fishingSkill int) int {
+	if fishingSkill <= 0 {
+		return 0
+	}
+	bonus := fishingSkill / 5
+	if bonus > 2 {
+		bonus = 2
+	}
+	return bonus
+}
+
+// rangerRareCatchUpgrade implements §6.2 — Ranger +20% rare catch rate.
+// When the harvest outcome is Common or Standard for a fishing attempt
+// by a Ranger, 20% chance to upgrade to Rich. Returns the (possibly
+// upgraded) outcome.
+func rangerRareCatchUpgrade(class DnDClass, action HarvestAction, outcome HarvestOutcome, rng *rand.Rand) HarvestOutcome {
+	if class != ClassRanger || action != HarvestFish {
+		return outcome
+	}
+	if outcome != OutcomeCommon && outcome != OutcomeStandard {
+		return outcome
+	}
+	if rngFloat(rng) < 0.20 {
+		return OutcomeRich
+	}
+	return outcome
+}
+
+// feywildFishDistortion narrates a Time Distortion flicker on a fishing
+// attempt in Feywild Crossing. 15% chance per attempt; pure flavor for
+// R4b (mechanical Time Loop event lives in the temporal-events system
+// and is not duplicated here).
+func feywildFishDistortion(zoneID ZoneID, action HarvestAction, rng *rand.Rand) string {
+	if zoneID != ZoneFeywildCrossing || action != HarvestFish {
+		return ""
+	}
+	if rngFloat(rng) >= 0.15 {
+		return ""
+	}
+	line := flavor.Pick(flavor.FeywildTimeDistortionHalf)
+	if line == "" {
+		line = flavor.Pick(flavor.FeywildTimeLoop)
+	}
+	if line == "" {
+		return ""
+	}
+	return "_⏳ " + line + "_\n\n"
+}