fix: read Spymaster deaths on the main thread for async income previews

[ryanbarlow97]

Players on Main still see "income estimate unavailable" after #167. Since this morning's 06:10 restart (SF 4.5.0, TLibs 2.6.1), all 141 preview failures share one cause:

IllegalStateException: Character identity must be used on the main thread
  at Characters.requireMainThread (tlibs)
  at Members$SharedResolver.info → OfficeCharacters.isDead → EspionageService.deadCharacter
  → validHolder → stabilityModifiers → Government.getStabilityModifiers → StateStability
  → Province.foreignTradeFactor → … → BranchIncomePreview.estimate (worker thread)

The Spymaster vacancy check asks TLibs whether the holder's character is dead, and TLibs only answers on the main thread. Branch upgrade previews and law/treaty impact previews both fail this way.

FrozenBalances is now FrozenReads. Each preview copy also captures every realm's espionage stability modifiers on the main thread, and Government.getStabilityModifiers() reads those inside a frozen read. Outside a frozen read nothing changes. A realm created after capture gets no espionage modifiers in that preview.

The new test replaces TLibs with a resolver that refuses lookups off the capturing thread and uses a dead Spymaster. It shows the live call throws on a worker and the frozen read gives "Vacant Spymaster".

Docs: TF-Minecraft/Docs#265

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⚙️ Run configuration

• Configuration used: Organization UI
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📥 Commits

Reviewing files that changed from the base of the PR and between 44deabc and e4aefab.

📒 Files selected for processing: 3

• src/main/java/net/tfminecraft/simplefactions/economy/FrozenReads.java
• src/main/java/net/tfminecraft/simplefactions/guild/income/Ledger.java
• src/test/java/net/tfminecraft/simplefactions/economy/FrozenReadsTest.java

📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • Economic previews now use consistent snapshots of guild balances and espionage modifiers, helping ensure calculations remain stable when run asynchronously.
  • Live data is restored after preview calculations, including nested reads and calculations that encounter errors.

The change replaces FrozenBalances with FrozenReads. The new snapshot captures guild bank balances and faction espionage modifiers for scoped reads. Preview objects and their consumers now use this snapshot.

Changes: Frozen reads

Layer / File(s)	Summary
Capture and scope frozen reads src/main/java/net/tfminecraft/simplefactions/economy/FrozenBalances.java, src/main/java/net/tfminecraft/simplefactions/economy/FrozenReads.java, src/test/java/net/tfminecraft/simplefactions/economy/*	FrozenReads captures account balances and espionage modifiers. Scoped reads restore the previous snapshot after work completes. Tests cover asynchronous and nested reads, live-read restoration, and espionage data.
Migrate previews and consumers src/main/java/net/tfminecraft/simplefactions/guild/income/*, src/main/java/net/tfminecraft/simplefactions/managers/inventory/BranchIncomePreviewService.java, src/main/java/net/tfminecraft/simplefactions/objects/Bank.java, src/main/java/net/tfminecraft/simplefactions/government/Government.java, src/main/java/net/tfminecraft/simplefactions/utils/EconomicImpactService.java, src/test/java/net/tfminecraft/simplefactions/utils/*	Preview objects expose reads() instead of balances(). Economic calculations, bank wealth reads, and government stability lookups use FrozenReads. Related test fixtures now mock the new read scope.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Prepared as EconomicPreview.Prepared
  participant Service as EconomicImpactService
  participant Reads as FrozenReads
  Prepared->>Reads: capture snapshot
  Service->>Prepared: request reads()
  Prepared-->>Service: return FrozenReads
  Service->>Reads: run calculation inside read scope
  Reads-->>Service: execute work with snapshot active

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Suggested reviewers: drefvelin

Merge Risk: 🟡 Moderate · up to 44dea

The new test may leave character lookups altered for later tests. Confirm and restore the resolver’s prior state before merging.

- [ ] Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at
@src/test/java/net/tfminecraft/simplefactions/economy/FrozenReadsTest.java:
- Line 129: Update FrozenReadsTest.tearDown() to call Members.setResolver(null)
so the test restores the shared resolver alongside FactionManager.factions.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: ac8e3b7d-8647-4c0a-b531-d309885ca17e

📥 Commits

Reviewing files that changed from the base of the PR and between f626ef4 and 44deabc.

📒 Files selected for processing: 12

• src/main/java/net/tfminecraft/simplefactions/economy/FrozenBalances.java
• src/main/java/net/tfminecraft/simplefactions/economy/FrozenReads.java
• src/main/java/net/tfminecraft/simplefactions/government/Government.java
• src/main/java/net/tfminecraft/simplefactions/guild/income/BranchIncomePreview.java
• src/main/java/net/tfminecraft/simplefactions/guild/income/EconomicPreview.java
• src/main/java/net/tfminecraft/simplefactions/managers/inventory/BranchIncomePreviewService.java
• src/main/java/net/tfminecraft/simplefactions/objects/Bank.java
• src/main/java/net/tfminecraft/simplefactions/utils/EconomicImpactService.java
• src/test/java/net/tfminecraft/simplefactions/economy/FrozenBalancesTest.java
• src/test/java/net/tfminecraft/simplefactions/economy/FrozenReadsTest.java
• src/test/java/net/tfminecraft/simplefactions/utils/EconomicImpactCoverageTest.java
• src/test/java/net/tfminecraft/simplefactions/utils/EconomicImpactServiceCoverageTest.java

💤 Files with no reviewable changes: 2

• src/test/java/net/tfminecraft/simplefactions/economy/FrozenBalancesTest.java
• src/main/java/net/tfminecraft/simplefactions/economy/FrozenBalances.java

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[ryanbarlow97]

Reviewed by GPT-6.1-Sol (xhigh) in two rounds: round 1 found the Dowsing node-upkeep path (fixed in e4aefab), round 2 OK. CodeRabbit is rate-limited, so admin-merging.