fix(core): treat mint quote expiry as advisory

[Egge21M]

This pull request fixes local Mint Quote expiry handling so expiry is advisory payment-deadline metadata.

Problem

Coco treated elapsed Mint Quote expiry as terminal in claimability, preparation, recovery, and watcher paths. That could hide valid accounting increases, block issuance of paid value, or stop observing quotes that can still resolve after expiry.

Summary

• remove Mint Quote expiry from local claimability and preparation decisions
• keep BOLT12 and on-chain recovery and pending reconciliation active after expiry
• keep Background Watchers observing expired Mint Quotes while preserving BOLT11 issued-state termination
• retain expiry metadata in transport deduplication without deriving behavior from the local clock
• document the decision in the glossary and ADR-0008
• add a core patch changeset and focused regression coverage
• update Centralize Mint Quote Claimability behind canonical accounting #387 so its future common claimability model explicitly ignores expiry

Melt Quote expiry semantics and existing mint-rejection error handling are unchanged.

Verification

• bun test test/unit/MintOperationService.test.ts test/unit/MintOperationWatcherService.test.ts test/unit/MintBolt12Handler.test.ts test/unit/MintOnchainHandler.test.ts test/unit/HybridTransport.test.ts — 162 passed
• bun run --filter='@cashu/coco-core' test:unit — 1,149 passed
• bun run --filter='@cashu/coco-core' typecheck
• bun run --filter='@cashu/coco-core' build
• Prettier check for all changed files
• git diff --check

This pull request resolves #390.

[changeset-bot]

🦋 Changeset detected

Latest commit: 766696d

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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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.63%. Comparing base (3be20ba) to head (766696d).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #397      +/-   ##
==========================================
- Coverage   92.65%   92.63%   -0.03%     
==========================================
  Files         112      111       -1     
  Lines       17694    17633      -61     
==========================================
- Hits        16395    16334      -61     
  Misses       1299     1299              

Flag	Coverage Δ
core-integration	50.31% <ø> (ø)
core-unit	93.07% <100.00%> (-0.03%)	⬇️

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