resolveClaudeBinary threw eagerly inside buildOptions, breaking unit tests
that mock the SDK at the module level (env, redesign, interrupt-restart-
regression suites). The user-facing fail-fast already lives in isAvailable();
in buildOptions, fall back to omitting pathToClaudeCodeExecutable so the SDK
surfaces its own error if the binary truly is missing.
Mohamed Boudra
d708f099be