refactor resolve logic and gas defaults in test_precompile_call

Extract ExpectedOutcome dataclass with factory methods, add
_normalize() for parameterless function edge cases, and centralize
gas computation in scenario_call_code so callers no longer need to
manually calculate gas. Simplify resolve_outcome_pair by sorting
scenarios by priority and adding stipend threshold check.

Co-Authored-By: Claude claude-opus-4-6

Author: pdobacz