diag(todo-continuation): add comprehensive debug logging for session idle handling

Add [TODO-DIAG] console.error statements throughout the todo continuation
enforcer to help diagnose why continuation prompts aren't being injected.

Changes:
- Add session.idle event handler diagnostic in handler.ts
- Add detailed blocking reason logging in idle-event.ts for all gate checks
- Update JSON schema to reflect circuit breaker config changes

🤖 Generated with assistance of [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

assets/oh-my-opencode.schema.json

@@ -3716,15 +3716,10 @@
               "minimum": 10,
               "maximum": 9007199254740991
             },
-            "windowSize": {
+            "consecutiveThreshold": {
               "type": "integer",
               "minimum": 5,
               "maximum": 9007199254740991
-            },
-            "repetitionThresholdPercent": {
-              "type": "number",
-              "exclusiveMinimum": 0,
-              "maximum": 100
             }
           },
           "additionalProperties": false