[fix] bid/ask unbounded loop while preserving no-overshoot

[cryptomilkbeard]

What

• Replace the unbounded decrement loop in findY0AndDeltaY with a bounded, formula-based adjustment that preserves the no‑overshoot guarantee.
• Add a regression test that demonstrates the pathological bid-side case and enforces a 15s max runtime.

Why

• The previous while (true) loop could run excessively long for certain parameter combinations. This causes hangs in certain cases.
• We still need the “totalAmountY ≤ amountY” behavior.

Notes

• The adjustment computes the total-amount coefficient and reduces baseDeltaY in a single step when overshoot occurs.
• New test: ts-client/src/test/liquidity_strategy_timeout.test.ts.

How to test

• cd ts-client && npx jest src/test/liquidity_strategy_timeout.test.ts