Implement Uniswap V2-style fees-in-reserves: the full swap_amount_in is
deposited into the reserve (growing k = reserve_a * reserve_b), while
only the fee-adjusted effective_amount_in is used to compute the output
amount. This means LPs earn fees proportionally on every removal via
k-growth rather than through a separate vault surplus.
- swap_logic: add fee_bps parameter; compute effective_amount_in for
output formula only; return full swap_amount_in as the reserve deposit
- Fix all integration test fixture values to match fees-in-reserves math
- Remove dead-code vault_a/b_init_zero helpers from unit tests
Remove the `active: bool` field from `PoolDefinition` and replace it with an
implicit invariant: a pool is considered active when
`liquidity_pool_supply >= MINIMUM_LIQUIDITY`.
BREAKING CHANGE: `PoolDefinition` Borsh serialization format has changed.
Existing on-chain pool accounts encoded with the `active` field are
incompatible with this version.
Closes#25
- accept a supported fee tier in pool creation
- store fee tiers in AMM pool state and validate them
- update AMM tests and IDL for the new pool creation argument
Renames the Swap instruction and its guest handler to SwapExactInput to
distinguish it from the newly added SwapExactOutput, and to make the
intent of each variant explicit at the call site.
BREAKING CHANGE: the Swap instruction variant and swap() function are
renamed to SwapExactInput and swap_exact_input(). Callers must update
instruction construction and any IDL-generated bindings.
Permanently lock `MINIMUM_LIQUIDITY` (1_000) LP tokens in a dedicated
LP-lock holding PDA on pool creation, following the Uniswap v2 "dead
shares" pattern. The pool creator receives `initial_lp - MINIMUM_LIQUIDITY`
tokens instead of the full initial_lp amount.
Adds `compute_lp_lock_holding_pda` and `LP_LOCK_HOLDING_PDA_SEED` to
amm_core, updates new_definition to emit two sequential chained calls
(create LP definition + lock holding, then mint user share), and adjusts
remove liquidity to account for the permanently locked floor.
BREAKING CHANGE: NewDefinition instruction requires an additional LP-lock
holding account derived via `compute_lp_lock_holding_pda(amm_program_id, pool_id)`.
