Add documentation for AI quest completion behavior (#5928)

Documents which quests the AI proactively attempts to complete via
FulfillQuestsCommandSelector and which quests are not handled.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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# AI Quest Completion Behavior
This document describes which quests the AI attempts to complete proactively to recruit unaffiliated heroes.
## Overview
The AI attempts to complete quests via `FulfillQuestsCommandSelector`, which is invoked by `MidGameAIClient.chosenFulfillEasyQuestsCommand`. The AI only considers quests from unaffiliated heroes in provinces ruled by a faction leader.
## Quests the AI Actively Completes
### Diplomacy Quests
| Quest | Handler | Conditions |
|-------|---------|------------|
| `AllianceQuest` | `AllianceQuestCommandChooser` | Target faction must meet trust conditions for alliance and not already be in an alliance |
| `TruceWithFactionQuest` | `TruceWithFactionQuestCommandChooser` | Target faction must meet trust conditions for truce |
| `TruceCountQuest` | `TruceCountQuestCommandChooser` | Picks a random faction that meets trust conditions and isn't already in a truce/alliance |
### Resource Giving Quests
| Quest | Handler | Notes |
|-------|---------|-------|
| `AlmsToProvinceQuest` | `AlmsToProvinceQuestCommandChooser` | Gives food to the specified province |
| `AlmsAcrossRealmQuest` | `AlmsAcrossRealmQuestCommandChooser` | Gives food from the province with the largest surplus |
| `GiveToHeroesInProvinceQuest` | `GiveToHeroesInProvinceQuestCommandChooser` | Gives gold to the hero with the lowest loyalty in the specified province |
| `GiveToHeroesAcrossRealmQuest` | `GiveToHeroesAcrossRealmQuestCommandChooser` | Gives gold from the province with the most gold available |
### Province Development Quests
| Quest | Handler | Notes |
|-------|---------|-------|
| `ImproveAgricultureQuest` | `ImproveQuestCommandChooser` | Issues an Improve command with Agriculture type |
| `ImproveEconomyQuest` | `ImproveQuestCommandChooser` | Issues an Improve command with Economy type |
| `ImproveInfrastructureQuest` | `ImproveQuestCommandChooser` | Issues an Improve command with Infrastructure type |
### Other Quests
| Quest | Handler | Conditions |
|-------|---------|------------|
| `DismissSpecificVassalQuest` | `DismissSpecificVassalCommandChooser` | Only if province has more than 2 heroes AND the unaffiliated hero's power >= target hero's power * `RequiredPowerMultiplierForDismiss` |
## Quests the AI Does Not Attempt to Complete
The following quests have no handler in `FulfillQuestsCommandSelector` and must be completed naturally through gameplay:
### Combat/Military Quests
- `DefeatFactionQuest` - Defeat a specific faction
- `GrandArmyQuest` - Accumulate a large number of troops
- `UpgradeBattalionQuest` - Upgrade a battalion to minimum armament/training
- `WinBattleOutnumberedQuest` - Win a battle while outnumbered
- `WinBattlesQuest` - Win a number of battles
- `RescueImprisonedLeaderQuest` - Rescue an imprisoned leader from another faction
### Expansion Quests
- `ExpandToProvincesQuest` - Expand to control a certain number of provinces
- `SpecificExpansionQuest` - Conquer a specific province
- `BorderSecurityQuest` - Have troops in a border province
### Prisoner Quests
- `ExecutePrisonerQuest` - Execute a specific prisoner
- `ExilePrisonerQuest` - Exile a specific prisoner
- `ReleasePrisonerQuest` - Release a specific prisoner
- `ReturnPrisonerQuest` - Return a prisoner to their faction
- `ReleaseAllPrisonersQuest` - Release all prisoners
### Province Order Quests
- `DevelopProvincesQuest` - Maintain provinces in Develop order for months
- `MobilizeProvincesQuest` - Maintain provinces in Mobilize order for months
- `RestProvinceQuest` - Use the Rest command in a specific province
### Reconnaissance Quests
- `ReconProvincesQuest` - Reconnoiter a number of provinces
- `ReconSpecificProvincesQuest` - Reconnoiter specific provinces
### Economic Quests
- `TotalDevelopmentQuest` - Achieve total development level in a province
- `WealthQuest` - Accumulate gold and food
- `SpendOnFeastsQuest` - Spend gold on feasts
- `SendSuppliesQuest` - Send food to a specific province
- `RepairDevastationQuest` - Repair devastation
### Special Event Quests
- `SuppressRiotByForceQuest` - Suppress a riot by force
- `FightBeastsAloneQuest` - Fight beasts alone
- `StartBlizzardQuest` - Start a blizzard in a province
- `StartEpidemicQuest` - Start an epidemic in a province
- `ApprehendOutlawQuest` - Apprehend an outlaw hero
### Miscellaneous
- `BattalionDiversityQuest` - Have diverse battalion types
- `SwearBrotherhoodWithHeroQuest` - Swear brotherhood with a specific hero
- `BetrayAllyQuest` - Betray an allied faction
## Implementation Details
The quest completion logic is located in:
- `FulfillQuestsCommandSelector.scala` - Main entry point, iterates through choosers
- `quest_command_selectors/` - Individual quest handlers
Each chooser extends either:
- `QuestCommandChooser` - For quests requiring randomness
- `DeterministicQuestCommandChooser` - For quests with deterministic command selection
The AI prioritizes quests in the order they appear in `FulfillQuestsCommandSelector.choosers`:
1. Alliance
2. TruceWithFaction
3. Improve (Agriculture/Economy/Infrastructure)
4. AlmsToProvince
5. GiveToHeroesInProvince
6. AlmsAcrossRealm
7. GiveToHeroesAcrossRealm
8. TruceCount
9. DismissSpecificVassal