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/SDKAgent.ts

@@ -137,7 +137,7 @@ export class SDKAgent {
               id: 0, // Not used in prompt
               tool_name: message.tool_name!,
               tool_input: JSON.stringify(message.tool_input),
-              tool_output: JSON.stringify(message.tool_output),
+              tool_output: JSON.stringify(message.tool_response),
               created_at_epoch: Date.now()
             })
           },