fix: refactor e2e test to support dynamic operator amounts

[RonTuretzky]

Summary

• Refactored CheckSignature.s.sol to dynamically read operator count from environment
• Updated run-check-signatures.sh to support OPERATOR_NAMES environment variable
• Removed hardcoded 3-operator limitation

Context

Fixes #3 - The e2e test was previously configured to run with only 3 operators. Running with a different amount of operators was only partially supported, most notably in CheckSignature.sol where the number of operators was hardcoded.

Changes

1. CheckSignature.s.sol

• Replaced hardcoded operator structs (operator1, operator2, operator3) with dynamic arrays
• Added _readOperators() function that reads operator names from environment variable
• Modified signature aggregation logic to work with any number of operators

2. run-check-signatures.sh

• Added support for OPERATOR_NAMES environment variable
• Defaults to "testacc1,testacc2,testacc3" for backward compatibility

3. Documentation

• Created DYNAMIC_OPERATORS.md with usage instructions and examples

Usage

# Default (3 operators)
./scripts/run-check-signatures.sh

# Custom number of operators
export OPERATOR_NAMES="testacc1,testacc2"
./scripts/run-check-signatures.sh

Test Plan

• Verify e2e tests pass with default 3 operators
• Test with 2 operators
• Test with 5 operators (if test accounts are available)
• Ensure backward compatibility is maintained

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