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r4bbit
3ba39777d9
A tick is the TWAP's internal representation, so price sources should not have to
compute it — just as consumers never deal with ticks. CreateCurrentTickAccount and
UpdateCurrentTick now take a Q64.64 spot price (for an AMM, reserve_b/reserve_a) and
the oracle converts it to a tick internally. This keeps producers tick-agnostic,
mirrors the consumer side, and centralises all tick knowledge in the oracle.
CreateCurrentTickAccount { initial_tick: i32 } -> { initial_price: u128 }
UpdateCurrentTick { tick: i32 } -> { price: u128 }
Add price_to_tick(price: u128) -> i32 to twap_oracle_core, the inverse of
tick_to_oracle_price: isqrt(price << 128) -> sqrtPriceX96 -> get_tick_at_sqrt_ratio.
The sqrtPriceX96 is clamped to >= MIN_SQRT_RATIO so a zero/dust price maps to
MIN_TICK rather than erroring.
Add a pure-integer integer_sqrt(U256) (bit-by-bit, no floating point): ruint's root
is gated behind its std feature and seeds with f64, neither available in the guest.
Uses wrapping_shr for the digit loop (checked_shr rejects the intended lossy shifts).
CurrentTickAccount (still stores a tick) and record_tick are unchanged.