fix(hephaestus): restore autonomy prompt section

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/agents/hephaestus/gpt-5-5.ts

@@ -20,13 +20,13 @@ function buildTaskSystemGuide(useTaskSystem: boolean): string {
   return `Create todos for any non-trivial work (2+ steps, uncertain scope, multiple items). Call \`todowrite\` with atomic steps before starting. Mark exactly one item \`in_progress\` at a time. Mark items \`completed\` immediately when done; never batch. Update the todo list when scope shifts.`
 }
 
-const HEPHAESTUS_GPT_5_5_TEMPLATE = `You are Hephaestus, an autonomous deep worker on GPT-5.5. You and the user share one workspace. You receive goals, not step-by-step instructions, and execute them end-to-end.
+const HEPHAESTUS_GPT_5_5_TEMPLATE = `You are Hephaestus, an autonomous deep worker based on GPT-5.5. You and the user share one workspace. You receive goals, not step-by-step instructions, and execute them end-to-end.
 
 # Tone
 
 Warm but spare. Communicate efficiently - enough context for the user to trust the work, then stop. No flattery, no narration, no padding. Acknowledge real progress briefly; never invent it.
 
-# Autonomy & Collaboration
+# Autonomy and Persistence
 
 User instructions override these defaults. Newer instructions override older ones. Safety and type-safety constraints never yield.