fix(core): make memory transactions rollback-safe

[Egge21M]

Summary

• make in-memory repository transactions commit and roll back atomically across repositories
• preserve stable repository references held by existing services
• serialize root repository operations around active transactions so rollback cannot erase unrelated writes
• add regression coverage for create, update, delete, stable-reference, and concurrent-write behavior
• add a patch Changeset for @cashu/coco-core

Problem

MemoryRepositories.withTransaction previously invoked the callback directly, so a thrown callback could leave partial durable state behind. A snapshot-only implementation would also risk rolling back unrelated root writes made while a transaction was active.

This pull request resolves #422.

Scope

This is limited to rollback-safe in-memory transactions and regression tests. It does not introduce a Batch Mint Operation model, repository, public API, migration, or runtime behavior.

Verification

• bun run --filter='@cashu/coco-core' test -- test/unit/MemoryRepositories.test.ts
• bun run --filter='@cashu/coco-core' test:unit — 1,245 passed
• bun run --filter='@cashu/coco-core' build
• bun run --filter='@cashu/coco-core' typecheck
• SQLite3 repository contract
• Bun SQLite repository contract
• Expo SQLite repository contract
• IndexedDB Chromium repository contract — 54 passed
• Prettier check
• git diff --check

Changeset

• .changeset/safe-memory-transactions.md

[changeset-bot]

🦋 Changeset detected

Latest commit: 53dd6b9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

Name	Type
@cashu/coco-core	Patch
@cashu/coco-adapter-tests	Patch
@cashu/coco-expo-sqlite	Patch
@cashu/coco-indexeddb	Patch
@cashu/coco-react	Patch
@cashu/coco-sql-storage	Patch
@cashu/coco-sqlite-bun	Patch
@cashu/coco-sqlite	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[codecov]

Codecov Report

❌ Patch coverage is 97.69231% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.43%. Comparing base (eb21988) to head (53dd6b9).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
...ges/core/repositories/memory/MemoryRepositories.ts	97.69%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #429      +/-   ##
==========================================
+ Coverage   93.40%   93.43%   +0.03%     
==========================================
  Files         113      113              
  Lines       17930    18059     +129     
==========================================
+ Hits        16748    16874     +126     
- Misses       1182     1185       +3     

Flag	Coverage Δ
core-integration	52.73% <97.69%> (+2.80%)	⬆️

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