refactor(worker): rename claude-executor to pi-executor

apps/worker/src/utils/billing-detection.ts

@@ -9,7 +9,7 @@
  *
  * Anthropic's spending cap behavior is inconsistent:
  * - Sometimes a proper SDK error (billing_error)
- * - Sometimes Claude responds with text about the cap
+ * - Sometimes the agent responds with text about the cap
  * - Sometimes partial billing before cutoff
  *
  * This module provides defense-in-depth detection with shared pattern lists
@@ -17,7 +17,7 @@
  */
 
 /**
- * Text patterns for SDK output sniffing (what Claude says).
+ * Text patterns for SDK output sniffing (what the agent says).
  * Used by message-handlers.ts and the behavioral heuristic.
  */
 export const BILLING_TEXT_PATTERNS = [
@@ -67,7 +67,7 @@ export function matchesBillingApiPattern(message: string): boolean {
 /**
  * Behavioral heuristic for detecting spending cap.
  *
- * When Claude hits a spending cap, it often returns a short message
+ * When the agent hits a spending cap, it often returns a short message
  * with $0 cost. Legitimate agent work NEVER costs $0 with only 1-2 turns.
  *
  * This combines three signals: