Ethers 6 and Simpler init from json

[zavelevsky]

Note

Migrate SDK to ethers v6 with BigInt-based numerics, refactor APIs and matchers, simplify ChainCache schema, and update demos/tests and build tooling accordingly.

• Core Types & Numerics:
  • Replace BigNumber with native bigint across SDK (common/types, utils/numerics, utils/serializers, utils/encoders).
  • Adjust encoders/match utilities to BigInt math and return types.
• Contracts API (ethers v6):
  • Switch to ethers v6 (Provider, Interface, TransactionRequest) and event APIs (getEvent, bigint args).
  • Update Reader multicall targets (contract.target), fee getters return number.
  • Update Composer populate calls and overrides to use bigint.
• Trade Matcher & Strategy Management:
  • Refactor match/trade logic to bigint; update Toolkit helpers and fee math.
• Chain Cache:
  • Bump scheme to 7; simplify serialized dump (remove trades/blocks metadata), convert to RetypeBigIntToString.
  • Add cache-miss handler flow; fix strategy updates/deletes using bigint IDs; change pair key separator to _.
• Adapters (Uni v3):
  • Use bigint for addresses/fields; liquidity/tick calculations unchanged in behavior.
• Demo:
  • Update provider init to new ethers.JsonRpcProvider and event filter usage.
• Build & Deps:
  • Upgrade to TypeChain ethers-v6; move ethers@^6 to peerDep; bump version to 0.0.126-DEV.
• Tests:
  • Update all specs to bigint, new separators, ethers v6 behaviors, and revised ChainCache schema.

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Bug: Missing Number() conversion for bigint event arguments

In ethers v6, parsedLog.args.newFeePPM returns a bigint instead of a number. At line 422, this value is assigned to eventData: number without conversion, and at line 434 it's placed into a TradingFeeUpdate tuple which expects number at the third position. Other places in this file (lines 250, 264, 273, 316) correctly use Number() to convert similar bigint values. This inconsistency could cause runtime type mismatches when the event data is consumed elsewhere.

Additional Locations (1)

• src/contracts-api/Reader.ts#L433-L434