Replace silent returns in continueIteration with a discriminated union\n(dispatched | session_creation_rejected | dispatch_rejected). Wraps\ninjectContinuationPrompt in try/catch so reset-strategy createIterationSession\nreturning null and promptAsync rejections both surface as typed failures\nthe caller can react to.
Closes#1901
Add 'default_strategy' config option (default: 'continue') to control whether ralph-loop creates a new session per iteration ('reset') or keeps the same session ('continue'). The 'reset' strategy keeps the model in the smart zone by starting with fresh context for each iteration.
Supports --strategy flag for per-command override.
YeonGyu-Kim