feat: enhance CI wallet management and context handling
- Updated `docker-compose.ci.yml` to include a new step for checking wallet status after bootstrap. - Expanded `README.md` to clarify the CI process, detailing the new `wallet-status.ts` script and its role in confirming wallet funding. - Modified `bootstrap.ts` to derive and store signer stake addresses, and updated the context schema to version 3 to accommodate new fields. - Enhanced `inspect-context.ts` to display signer stake addresses and SDK multisig reward address. - Adjusted context validation in `context.ts` to ensure compatibility with the new schema and added checks for signer stake addresses.