feat(core): coordinate recoverable mint swaps

[igbopharaoh]

Summary

• adds the dormant exact-receive Mint Swap coordinator and parent state machine
• enforces authorization-before-network barriers, parent-owned child operations, exact accounting, and fenced preparation leases
• recovers source and destination outcomes from durable protocol evidence and moves contradictions to needs_attention

Dependency

This pull request is stacked on Slice 2 (#402) and Slice 3 (#417). It is intentionally opened against master; merge the earlier slices first, then rebase this branch before merge.

This pull request resolves #369.

Verification

• bun run build
• bun run typecheck
• bun run --filter='@cashu/coco-core' test:unit
• SQLite, Expo SQLite, SQLite Bun, and IndexedDB repository contracts

[changeset-bot]

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Latest commit: b02604e

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