fix(prompts): point planning guidance at plan subagent

src/agents/dynamic-agent-core-sections.ts

@@ -196,7 +196,7 @@ export function buildNonClaudePlannerSection(model: string): string {
 Multi-step task? **ALWAYS consult Plan Agent first.** Do NOT start implementation without a plan.
 
 - Single-file fix or trivial change → proceed directly
-- Anything else (2+ steps, unclear scope, architecture) → \`task(subagent_type="prometheus", ...)\` FIRST
+- Anything else (2+ steps, unclear scope, architecture) → \`task(subagent_type="plan", ...)\` FIRST
 - Use \`task_id\` to resume the same Plan Agent - ask follow-up questions aggressively
 - If ANY part of the task is ambiguous, ask Plan Agent before guessing
 

src/agents/sisyphus/gpt-5-4.ts

@@ -288,7 +288,7 @@ Every implementation task follows this cycle. No exceptions.
    Follow \`<explore>\` protocol for tool usage and agent prompts.
 
 2. PLAN - List files to modify, specific changes, dependencies, complexity estimate.
-   Multi-step (2+) → consult Plan Agent via \`task(subagent_type="prometheus", ...)\`.
+   Multi-step (2+) → consult Plan Agent via \`task(subagent_type="plan", ...)\`.
    Single-step → mental plan is sufficient.
 
    <dependency_checks>