Release v5.1.3: Fix PostToolUse hook field name bug

Bug Fix:
- Changed tool_output to tool_response throughout PostToolUse hook chain
- PostToolUse events provide tool_response field, not tool_output
- Updated save-hook.ts to send tool_response
- Updated worker-service.ts endpoint to accept tool_response
- Updated worker-service-v2.ts for consistency
- Updated worker-types.ts interfaces (PendingMessage, ObservationData)
- Updated SessionManager.ts message queue
- Updated SDKAgent.ts observation prompt builder

Impact: Fixes observation capture for PostToolUse events. Previous version was sending undefined for tool responses, causing incomplete observations.

Files changed:
- src/hooks/save-hook.ts (interface + destructuring + fetch body)
- src/services/worker-service.ts (ObservationMessage interface + handler + SDK prompt)
- src/services/worker-service-v2.ts (handler)
- src/services/worker-types.ts (PendingMessage + ObservationData interfaces)
- src/services/worker/SessionManager.ts (queue push)
- src/services/worker/SDKAgent.ts (observation prompt)
- plugin/scripts/*.js (rebuilt)
- Version bumped to 5.1.3 (patch)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/services/worker/SessionManager.ts

@@ -80,7 +80,7 @@ export class SessionManager {
       type: 'observation',
       tool_name: data.tool_name,
       tool_input: data.tool_input,
-      tool_output: data.tool_output,
+      tool_response: data.tool_response,
       prompt_number: data.prompt_number
     });