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e61cd594b5
Adds a new `SyncReserves` instruction that updates a pool's recorded reserves to match the actual vault balances. This allows the pool to absorb donations (direct token transfers to vaults) without breaking the invariant — only upward adjustments are permitted; vaults may not be under-collateralized relative to reserves. Vault reading helpers (`read_fungible_holding`, `read_vault_fungible_balances`) are implemented in `amm_core` so they can be shared across instructions without crossing crate boundaries.