feat(ralph-loop): add strategy option for fresh context per iteration

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.

src/features/builtin-commands/commands.ts

@@ -28,7 +28,7 @@ ${RALPH_LOOP_TEMPLATE}
 <user-task>
 $ARGUMENTS
 </user-task>`,
-     argumentHint: '"task description" [--completion-promise=TEXT] [--max-iterations=N]',
+     argumentHint: '"task description" [--completion-promise=TEXT] [--max-iterations=N] [--strategy=reset|continue]',
    },
    "ulw-loop": {
      description: "(builtin) Start ultrawork loop - continues until completion with ultrawork mode",
@@ -39,7 +39,7 @@ ${RALPH_LOOP_TEMPLATE}
 <user-task>
 $ARGUMENTS
 </user-task>`,
-     argumentHint: '"task description" [--completion-promise=TEXT] [--max-iterations=N]',
+     argumentHint: '"task description" [--completion-promise=TEXT] [--max-iterations=N] [--strategy=reset|continue]',
    },
   "cancel-ralph": {
     description: "(builtin) Cancel active Ralph Loop",

src/features/builtin-commands/templates/ralph-loop.ts

@@ -24,7 +24,7 @@ export const RALPH_LOOP_TEMPLATE = `You are starting a Ralph Loop - a self-refer
 ## Your Task
 
 Parse the arguments below and begin working on the task. The format is:
-\`"task description" [--completion-promise=TEXT] [--max-iterations=N]\`
+\`"task description" [--completion-promise=TEXT] [--max-iterations=N] [--strategy=reset|continue]\`
 
 Default completion promise is "DONE" and default max iterations is 100.`